To learn formal and informal English quickly, begin with who you are speaking to, why, and how clearly the message needs to be understood. “Can you send the file?” is natural with a colleague; “Could you send the file, please?” may sound more courteous in a new professional relationship. Neither is automatically better English. The useful skill is choosing the level of formality that fits the reader and preserves the facts.
If you searched for formal and informal English examples, formal vs informal vocabulary, professional English phrases, how to write a formal email, or informal to formal English sentences, this guide provides sixty paired expressions, explanations of register, realistic rewrites, sample emails, common mistakes, a seven-day learning plan and a self-test. It is intended for everyday communication, customer service, workplace writing and professional situations rather than one particular school syllabus.
Quick answer: First state the intended message in plain words. Then select its register: informal for relaxed conversations with people you know well, neutral for most everyday interactions, or more formal where distance, seriousness or conventions call for it. Make the sentence polite without hiding its meaning, adding new facts or promising action you cannot take.
Formal and informal English: sixty paired examples
These are useful editorial examples, not a verified ranking of the most-searched expressions. The left-hand wording is usually casual; the right-hand version is more neutral or more formal. A rewrite may soften tone or make the intended action more explicit, so always check that it still represents what you want to say.
Some expressions are fully grammatical in both registers. Informal does not mean incorrect, and formal does not mean more accurate. Cambridge Dictionary explains that formality varies with situation, audience and purpose in its Formal and Informal Language guide.
Group 1: Greetings, introductions and endings
- 1. Informal: “Hi!” Neutral/professional: “Hello.” — Purpose: opening a conversation.
- 2. Informal: “Hey, how’s it going?” Neutral/professional: “Hello. How are you?” — Purpose: asking how someone is.
- 3. Informal: “Nice to meet ya.” Neutral/professional: “It’s a pleasure to meet you.” — Purpose: meeting someone for the first time.
- 4. Informal: “What’s up?” Neutral/professional: “How have you been?” — Purpose: inviting a general update.
- 5. Informal: “I’m Alex, by the way.” Neutral/professional: “My name is Alex.” — Purpose: introducing yourself.
- 6. Informal: “Long time no see!” Neutral/professional: “It’s been a long time since we last met.” — Purpose: acknowledging a gap.
- 7. Informal: “Catch you later.” Neutral/professional: “I look forward to speaking with you again.” — Purpose: closing with future contact in mind.
- 8. Informal: “Talk soon.” Neutral/professional: “I hope we can speak again soon.” — Purpose: expressing an intention to reconnect.
- 9. Informal: “Thanks a ton.” Neutral/professional: “Thank you very much.” — Purpose: expressing strong thanks.
- 10. Informal: “Cheers,” Neutral/professional: “Kind regards,” — Purpose: closing an appropriate written message, with different register.
How to use this group: “Hey” and “Hello” both open an interaction; one is generally more casual. The email closings Cheers and Kind regards vary by culture and relationship, and neither is right for every correspondent. A professional message can still sound warm. Practise the setting, not just a two-column substitution.
Group 2: Requests and permission
- 11. Informal: “Got a sec?” Neutral/professional: “Do you have a moment?” — Purpose: asking for someone’s time.
- 12. Informal: “Can you send the file?” Neutral/professional: “Could you send the file, please?” — Purpose: requesting a document.
- 13. Informal: “Gimme a minute.” Neutral/professional: “Could you give me a moment, please?” — Purpose: requesting short waiting time.
- 14. Informal: “Lemme check.” Neutral/professional: “Let me check the details.” — Purpose: indicating that you need to verify.
- 15. Informal: “Can I ask something?” Neutral/professional: “May I ask a question?” — Purpose: requesting permission to ask.
- 16. Informal: “Help me out?” Neutral/professional: “Would you be able to help me?” — Purpose: requesting assistance.
- 17. Informal: “Show me how?” Neutral/professional: “Could you show me how to do this?” — Purpose: requesting a demonstration.
- 18. Informal: “Can you say that again?” Neutral/professional: “Could you repeat that, please?” — Purpose: requesting repetition.
- 19. Informal: “Mind moving this?” Neutral/professional: “Would you mind moving this?” — Purpose: making a courteous request.
- 20. Informal: “Send me the address.” Neutral/professional: “Could you send me the address, please?” — Purpose: asking for a location in writing.
How to use requests: English often softens requests with could, would or may, but more words do not automatically mean more respect. “Could you send the file by Friday?” is specific. “Kindly facilitate the timely dispatch of the aforementioned document” is longer and less useful. A good request makes the action clear.
Group 3: Planning, meetings and availability
- 21. Informal: “Works for me.” Neutral/professional: “That arrangement is convenient for me.” — Purpose: accepting a proposed plan.
- 22. Informal: “Can’t make it.” Neutral/professional: “I won’t be able to attend.” — Purpose: declining attendance.
- 23. Informal: “Maybe next week?” Neutral/professional: “Would next week be possible?” — Purpose: suggesting another week.
- 24. Informal: “Let’s push it back.” Neutral/professional: “Could we postpone it?” — Purpose: requesting a later date or time.
- 25. Informal: “Let’s move it up.” Neutral/professional: “Could we arrange an earlier time?” — Purpose: requesting an earlier schedule.
- 26. Informal: “I’m running late.” Neutral/professional: “I’m sorry; I expect to arrive late.” — Purpose: reporting a delay in arrival.
- 27. Informal: “What’s the plan?” Neutral/professional: “Could you confirm the plan?” — Purpose: requesting plan details.
- 28. Informal: “Are we still on?” Neutral/professional: “Is the arrangement still confirmed?” — Purpose: checking whether a plan remains in place.
- 29. Informal: “I’ll get back to you.” Neutral/professional: “I’ll respond after checking the details.” — Purpose: promising a later response, with the verification step explicit.
- 30. Informal: “Let’s talk after.” Neutral/professional: “Let’s discuss this after the meeting.” — Purpose: arranging another conversation in a meeting context.
How to use time phrases: “Push it back” can be ambiguous to people who use scheduling terminology differently. “Postpone the meeting until Thursday” is clearer when a specific date matters. Running late is natural in informal and neutral English. In serious scheduling, confirm an actual time rather than replacing one vague phrase with another.
Group 4: Problems, corrections and support
- 31. Informal: “Something’s wrong.” Neutral/professional: “There appears to be a problem.” — Purpose: reporting an issue cautiously.
- 32. Informal: “This doesn’t work.” Neutral/professional: “The device is not functioning.” — Purpose: reporting a technical problem.
- 33. Informal: “I messed up.” Neutral/professional: “I made a mistake.” — Purpose: acknowledging an error.
- 34. Informal: “It’s broken.” Neutral/professional: “The item appears to be damaged or faulty.” — Purpose: describing a possible fault without an unsupported diagnosis.
- 35. Informal: “You sent the wrong one.” Neutral/professional: “The item received does not match the order.” — Purpose: describing an incorrect delivery.
- 36. Informal: “What’s with this charge?” Neutral/professional: “Could you explain this charge?” — Purpose: questioning a billing item.
- 37. Informal: “I want my money back.” Neutral/professional: “I would like to request a refund.” — Purpose: requesting a possible remedy.
- 38. Informal: “Fix it, please.” Neutral/professional: “Could you arrange for this issue to be reviewed and corrected?” — Purpose: requesting resolution.
- 39. Informal: “No clue what happened.” Neutral/professional: “I do not yet know what caused the problem.” — Purpose: expressing lack of knowledge.
- 40. Informal: “I’ll sort it out.” Neutral/professional: “I’ll investigate the issue and explain the next steps.” — Purpose: committing to a review rather than guaranteeing resolution.
How to report problems: A polite rewrite should not claim that an incident has been solved if staff have only begun investigating. “The device is not functioning” is a symptom, while “The device is faulty” may be a diagnosis requiring confirmation. The aim is to communicate evidence, not to soften a genuine problem out of existence.
Group 5: Work messages and emails
- 41. Informal: “Just FYI,” Neutral/professional: “For your information,” — Purpose: introducing relevant information.
- 42. Informal: “Here’s the doc.” Neutral/professional: “I have attached the document.” — Purpose: referring to an actual attachment.
- 43. Informal: “Pls check this.” Neutral/professional: “Could you review this, please?” — Purpose: requesting review.
- 44. Informal: “Any update?” Neutral/professional: “Could you provide a status update?” — Purpose: checking progress.
- 45. Informal: “Need it ASAP.” Neutral/professional: “Could you send it as soon as possible?” — Purpose: requesting urgency without a defined deadline.
- 46. Informal: “Let’s chat about it.” Neutral/professional: “Could we discuss this further?” — Purpose: suggesting a discussion.
- 47. Informal: “Looks good to me.” Neutral/professional: “The draft appears satisfactory to me.” — Purpose: expressing a favourable review rather than formal approval.
- 48. Informal: “I dunno yet.” Neutral/professional: “I do not have a confirmed answer yet.” — Purpose: acknowledging uncertainty.
- 49. Informal: “Big thanks for the help.” Neutral/professional: “Thank you for your assistance.” — Purpose: expressing appreciation.
- 50. Informal: “Ping me if needed.” Neutral/professional: “Please contact me if you need further information.” — Purpose: inviting further questions.
How to write work messages: Most professional emails benefit from a subject, an early statement of purpose, one specific action and a clear timeline. ASAP is a real expression but does not identify a precise deadline; if timing matters, give an exact date and time rather than relying on either informal or formal synonyms.
Group 6: Opinions, disagreement and careful claims
- 51. Informal: “I think so.” Neutral/professional: “That is my current understanding.” — Purpose: sharing a tentative view.
- 52. Informal: “Sounds good.” Neutral/professional: “That seems like a reasonable proposal.” — Purpose: expressing a positive initial reaction.
- 53. Informal: “I don’t buy it.” Neutral/professional: “I am not convinced by the explanation.” — Purpose: expressing doubt.
- 54. Informal: “That’s not right.” Neutral/professional: “That appears to be inaccurate.” — Purpose: questioning a claim.
- 55. Informal: “No way.” Neutral/professional: “I do not think that option is feasible.” — Purpose: declining a proposed approach.
- 56. Informal: “What a mess.” Neutral/professional: “The situation has become difficult to manage.” — Purpose: describing disorder or difficulty.
- 57. Informal: “You’ve got a point.” Neutral/professional: “I understand the reasoning behind your point.” — Purpose: acknowledging an argument.
- 58. Informal: “I’m kinda worried.” Neutral/professional: “I have some concerns.” — Purpose: expressing uncertainty or worry.
- 59. Informal: “Maybe it’ll work.” Neutral/professional: “It may be feasible, although it has not been verified.” — Purpose: expressing possibility without a guarantee.
- 60. Informal: “Let’s agree to disagree.” Neutral/professional: “We appear to have different views on this issue.” — Purpose: acknowledging unresolved disagreement.
How to handle disagreement: “I am not convinced” is a courteous way to express doubt; it does not mean the other person is necessarily wrong. Rewriting “That’s wrong” as “That appears inaccurate” softens certainty. Use a softer claim only when uncertainty is genuine; when a verified fact is wrong, state the correction clearly and respectfully.
What does ‘register’ mean in English?
Register is the style of language chosen for a purpose, audience and context. An informal text to a friend may use contractions, short phrases and everyday slang. A neutral work email may use complete sentences and polite requests. A legal or technical document may need specialised terminology and precise definitions.
Formal and informal are not the only possible categories. Neutral English often works best when communicating across cultures or organisations because it avoids both overly casual slang and excessively stiff wording. “Could you confirm the address?” is a good example of a clear, flexible request.
The Cambridge Dictionary register guide explains that registers also vary by profession and topic, not merely by whether a sentence is polite. A scientific report, a friendly invitation and a customer-support reply each have different communicative jobs.
Formal words are not automatically better words
The words start, begin and commence can overlap. Commence sounds more formal but may be unnecessary in an everyday email. Similarly, help and assist are often related; purchase is generally more formal than buy, and require can be more formal than need.
If your message is “The meeting starts at three,” replacing it with “The meeting shall commence at three o’clock” does not make the time clearer. Formality should help meet the audience’s expectations, not impress them with unnecessary length.
Plain English is particularly useful for readers who speak English as an additional language. Use precise dates, nouns and verbs, and avoid idioms that could be misunderstood.
Contractions: when ‘I’m’ and ‘we’ve’ are appropriate
I’m, you’re, we’re, don’t, can’t, we’ve and I’ll are normal in conversation and many everyday emails. Fully written forms such as I am, you are, we have and cannot may be preferred in some formal documents.
Do not assume contractions are unprofessional in every email. “I’m writing to confirm our appointment” is often perfectly acceptable in a courteous business message. The choice depends on organisational style and audience.
Avoid accidental differences in meaning. “I’ll check” promises a future check, while “I’ve checked” says the check has happened. Expanding the contraction will not change the tense, but misunderstanding it can lead to a false status report.
Slang and abbreviations: useful to recognise, optional to use
Expressions such as brb, lol, tbh, idk, gonna and wanna appear in casual speech or writing, but not all suit formal or cross-cultural situations. Knowing what they mean improves comprehension; you do not need to copy them to communicate naturally.
If someone writes “IDK yet,” a clear professional version is “I do not have that information yet.” Do not turn it into “The answer has not been confirmed” unless the person truly means a formal confirmation process. The rewritten sentence should preserve the actual state of knowledge.
For more examples, use Internet Slang and Texting Abbreviations. That guide focuses on decoding informal messages; this article focuses on choosing the appropriate style for a real recipient.
Four before-and-after messages
1. Requesting a document
Casual: “Hey, can you send me the report when you get a chance?”
Clear professional: “Hello, could you send me the updated report when it is available? Please let me know if anything is preventing completion. Thank you.”
The rewrite remains courteous but still lacks an exact deadline, because none was supplied in the original. If a deadline is genuinely required, add the real date: “by 4 pm Thursday.” Do not invent one simply to make the sentence look professional.
2. Correcting an invoice
Casual: “Hi, this bill looks wrong. Can you check?”
Clear professional: “Hello, I noticed a difference between the amount on the invoice and our order confirmation. Could you review the figures and explain the discrepancy? Thank you.”
This version is better not because it uses a rare word, but because it identifies what needs to be compared. Use the exact figures when you have verified them.
3. Declining an invitation
Casual: “Sorry, can’t make it.”
Clear professional: “Thank you for the invitation. Unfortunately, I won’t be able to attend.”
The formality changes, but the action remains the same: declining attendance. Do not add a reason you do not want to share or cannot verify.
4. Requesting clarification
Casual: “Wait, what? What are you saying?”
Clear professional: “Could you clarify the final point? I want to make sure I’ve understood your explanation correctly.”
This focuses on the part of the message that was unclear and gives the speaker a chance to repair the misunderstanding.
Politeness is not just adding ‘please’
Compare “Give me the file” and “Please give me the file.” The second may sound more courteous, but in some contexts it can still feel abrupt. “Could you send me the file, please?” offers a conventional request form. A firm deadline can be expressed politely: “Could you send the final version by Friday?”
Do not hide obligations behind excessive softness. A safety instruction might need to say “Do not enter the area,” not “It might perhaps be better if you avoided entering.” Direct language can be the safest and most respectful option when ambiguity would be harmful.
A polite message can also be honest about limitations: “I cannot confirm the refund until the request has been reviewed.” It would be misleading to say “Your refund will be processed shortly” without authority or evidence.
Professional English for different relationships
A close colleague
“Can we chat for five minutes?” may be a suitable and efficient request. The relationship is established, the task is ordinary, and excessive ceremony would add little value.
An unfamiliar client
“Could we arrange a short call to discuss the revised proposal?” is more explicit and courteous. Depending on the industry, you may also include an agenda, expected duration and proposed times.
A customer making a complaint
A customer can be firm: “My order confirmation lists two items, but only one arrived. Please explain the available options.” The sentence is not insulting, and it gives the business useful facts.
A support representative
A support agent should acknowledge a problem without promising a result prematurely: “Thank you for explaining the issue. I’ll check the order record and let you know which next steps we can confirm.”
A technical report
Use words defined in the relevant field. “The system did not meet the specified performance threshold” may be more precise than “The system is bad,” regardless of which phrase sounds more formal.
Ten vocabulary distinctions across formal and informal English
- Buy / purchase: both can refer to obtaining something by paying; purchase often sounds more formal.
- Help / assist: both involve helping; assist is common in professional or service registers.
- Start / commence: both refer to beginning; commence may sound ceremonial or administrative.
- End / terminate: terminate is common in technical, legal or formal contexts and can imply a particular ending process.
- Ask / enquire: both can concern seeking information; enquire may be more formal and is used differently across regions.
- Need / require: require can emphasise necessity or a formal condition.
- Tell / inform: inform can sound more formal, but the two verbs have different usage patterns.
- Check / verify: verify may imply establishing correctness with evidence, not a casual glance.
- Get / obtain: obtain often sounds formal and may indicate successfully acquiring something.
- Fix / resolve: resolve is common for issues, disputes and problems; fix is often more everyday and concrete.
These are tendencies, not universal substitutions. Check meaning and grammar before replacing a word. In formal writing, the simplest precise word is frequently the strongest choice.
A seven-day practice plan
Day 1 — Greeting and tone: rewrite ten casual greetings and closings for different recipients. Check that they still sound human and appropriate.
Day 2 — Requests: practise can, could, may, and would you mind with real actions. Avoid inventing deadlines.
Day 3 — Meetings: write one informal and one professional message about a reschedule. Include the exact time only if known.
Day 4 — Problems: practise reporting an invoice discrepancy, a delayed delivery and an unavailable service. Preserve the difference between a verified fact and a possible cause.
Day 5 — Emails: revise a short work message with a clear subject, purpose, action and suitable closing.
Day 6 — Disagreement: practise expressing a concern respectfully without implying agreement you do not have or certainty you cannot support.
Day 7 — Transfer: choose a new conversation and write three versions: friendly informal, neutral and more formal. Compare whether the underlying meaning remained accurate.
Twenty-question formal and informal English quiz
Choose a suitable neutral or professional rewrite. Sample answers follow each question.
1. “Got a sec?” → Do you have a moment? 2. “Can you send it?” → Could you send it, please? 3. “Thanks a ton.” → Thank you very much. 4. “Can’t make it.” → I won’t be able to attend. 5. “Maybe next week?” → Would next week be possible? 6. “I’m running late.” → I expect to arrive late. 7. “Pls check the file.” → Could you review the file, please? 8. “Any update?” → Could you provide a status update? 9. “I messed up.” → I made a mistake. 10. “This bill looks wrong.” → The amount on this bill appears incorrect. 11. “What’s with the fee?” → Could you explain this fee? 12. “I’ll sort it out.” → I’ll investigate the issue and explain the next steps. Do not claim it is already resolved. 13. “No clue.” → I don’t have that information yet. 14. “I don’t buy it.” → I’m not convinced by the explanation. 15. “Sounds good.” → That seems reasonable. 16. “Ping me.” → Please contact me. 17. “Need it ASAP.” → Could you send it as soon as possible? Specify a reliable deadline separately if needed. 18. “Let me check.” → I’ll verify the details. Use verify only if you will make an appropriate check. 19. “What a mess.” → The situation is difficult to manage. 20. “Let’s chat about this.” → Could we discuss this further?
Other versions may be appropriate. The test is whether the tone fits the recipient and the underlying meaning stays true.
Common mistakes when making English more formal
- Using words nobody needs: “utilise” is not automatically better than “use”.
- Adding an invented deadline: formality does not permit fictional facts.
- Making every sentence passive: “I will review the figures” can be clearer than “The figures will be reviewed”.
- Overusing kindly or please: courtesy also depends on clarity and tone.
- Replacing natural contractions unnecessarily: “I’m writing to confirm” is acceptable in many professional emails.
- Hiding a firm disagreement: be courteous but state the actual objection.
- Using specialist terms incorrectly: approve and review have distinct meanings.
- Assuming informal language is always wrong: friendly messages appropriately use relaxed English.
- Using idioms with unfamiliar audiences: plain wording often travels better.
- Treating a longer message as a better one: a short, clear request is often more useful.
Frequently asked questions
### What is the difference between formal and informal English? Formal English usually suits more serious, distant or conventional settings; informal English suits relaxed communication among familiar people. Register depends on audience and purpose.
### Is informal English grammatically incorrect? Not necessarily. Many informal expressions are completely grammatical. Slang, contractions and sentence fragments have different degrees of suitability by context.
### How do I make a sentence sound more professional? Make the action and factual details clear, use a respectful request form and remove unnecessary slang. Do not add vague corporate jargon.
### Is ‘could you’ more polite than ‘can you’? It can sound more tentative or courteous in many requests, but both are ordinary English. Tone, relationship and situation also matter.
### Do I need to avoid contractions in work emails? No universal ban applies. Contractions are common in neutral professional communication, while some formal documents prefer full forms.
### Is ‘commence’ better than ‘start’? Not automatically. Start is often clearer; commence may suit legal, administrative or ceremonial language.
### How formal should a complaint email be? Use a respectful, direct tone. Include the relevant facts, evidence, requested remedy and next step without exaggeration or threats.
### Can I use informal greetings with clients? It depends on the relationship, profession and established expectations. A neutral greeting such as “Hello” is often safe.
### How do I disagree politely in English? Acknowledge the other view where appropriate, state your concern and explain your reasoning: “I understand the point, but I have concerns about the timeline.”
### How can I practise changing register? Rewrite one message for a friend, an unfamiliar colleague and a formal service context. Check that the facts remain unchanged in all three versions.
Sources and related vocabulary guides
The Cambridge Dictionary Formal and Informal Language guide explains vocabulary, contractions and sentence structure across registers. The Register guide explains why professional domains and purposes also affect language choices.
For specific workplace situations, see Business English for Work. To decode informal shorthand, use Internet Slang and Texting Abbreviations. For handling complaints, continue to Customer Service and Complaint Phrases, or explore the Vocabulary Learning Hub.
Start today: choose one real message you’ve written and make two accurate versions—one for a friend and one for a professional recipient. Keep the facts identical. The right level of formality makes your English easier to trust.