“I stopped reading.” “I stopped to read.” The first sentence says the reading ended. The second says another activity paused so that reading could begin. Did you know that adding one small word can reverse a story’s direction? English has dozens of these choices, and they are much easier to learn when the student can see what the action is doing.
Gerunds and infinitives are verb forms that work inside larger sentences. A gerund is an -ing verb form used in a noun-like role, as in “Reading helps me relax.” An infinitive is the base form of a verb, often preceded by to, as in “I want to read.” Their core aim in English mastery is to connect actions to intentions, habits, memories and other actions without confusing which one happened or why. The right verb pattern makes the meaning reliable, even before the reader notices the grammar.
If you are searching for gerund vs infinitive rules, verbs followed by -ing or to, or gerund and infinitive exercises with answers, this guide gives you a usable system rather than an endless word list. It belongs within the English Grammar pathway and the eduKateSG English Learning Hub. We will ask three questions throughout: Is the action functioning like a thing, is it expressing a goal, and what does the first verb require?
Why we sometimes talk about an activity as if it were a thing
“Swimming is enjoyable.” In this sentence, swimming names an activity and functions as the subject. The sentence is about an activity rather than a person. “My friend enjoys swimming” makes the activity the object of enjoys. These noun-like roles are the heart of what school grammar usually calls a gerund.
Compare “She is swimming” with “Swimming keeps her active.” In the first, swimming is part of a progressive verb phrase, not a gerund functioning as a noun. The spelling looks the same; the grammatical job is different. Teaching this distinction matters because students who are told that every -ing word is a gerund may mislabel verb tenses and misunderstand sentence structure.
The practical test is not “Does it end with -ing?” but “What part does this word or phrase play in the sentence?” The ability to name an activity allows us to talk about preferences, habits and experiences compactly: “Cycling improves my mood,” “I enjoy cooking” and “They discussed changing the plan.”
Infinitives can describe what someone wants, plans or tries to do
“I hope to visit the museum.” “She decided to ask a question.” “We need to check the timetable.” Each example connects the first verb with an action contemplated, intended or required. The to-infinitive is not inherently about the future — infinitives can appear in a wide variety of meanings — but many common verbs of intention take this pattern.
A to-infinitive can also express purpose: “I opened the window to let in fresh air.” The phrase answers why the window was opened. That is different from “I opened the window and let in fresh air,” which reports two linked actions without the same explicit purpose framing. An infinitive is a tool for connecting intention to action.
The pattern families: start with useful verbs, not a giant chart
Common verbs followed by -ing
Words such as enjoy, avoid, finish, practise, consider, suggest and mind normally take an -ing form when another verb follows directly: “They enjoyed exploring the exhibition”; “I finished writing the summary”; “She suggested checking the figures.”
- Enjoy reading short stories.
- Avoid interrupting the speaker.
- Finish checking the calculations.
- Practise explaining the answer aloud.
- Consider taking a different route.
- Suggest reviewing the timetable.
A useful correction is “I enjoy reading”, not “I enjoy to read” in standard usage. But do not ask learners to memorise these words without sentences. Group examples by the job they do: enjoyment, avoidance, completion, suggestion. A student remembers patterns more reliably when each example makes sense in a familiar situation.
Common verbs followed by to + infinitive
Verbs such as want, hope, decide, plan, promise, offer, agree, learn and refuse typically take a to-infinitive directly: “We decided to walk home”; “He offered to explain the diagram”; “I hope to finish before lunch.”
- Want to improve the introduction.
- Plan to leave early.
- Promise to return the book.
- Agree to help a classmate.
- Offer to carry the bags.
- Learn to solve the puzzle.
Here the usual correction is “She decided to go”, not “She decided going” when followed directly by the verb. The initial verb chooses the pattern. This is sometimes called verb complementation, but the technical label matters less than being able to use and recognise the construction in actual English.
Verbs that accept both forms
“I like reading” and “I like to read” are both natural in many contexts. Love, hate, prefer, begin, start and continue may also appear with more than one pattern, though usage and subtle meanings can vary. Do not label one form wrong simply because a worksheet showed the other as its preferred answer.
When both forms are possible, read the situation. “I like swimming” often presents a general enjoyment of the activity. “I like to swim before breakfast” may describe a preferred routine. Those are tendencies, not rigid rules. A learner should be able to select a natural option and explain its meaning without pretending every alternative is impossible.
The four verb pairs that make the difference unforgettable
Stop doing versus stop to do
“The student stopped talking” means that talking ceased. “The student stopped to talk” means the student paused another activity in order to talk. Imagine someone walking down a corridor: they stop walking, then talk to a friend. The first verb pattern describes an ending; the second gives a purpose for stopping.
Try acting it out. Walk across a room, stop to check a phone, then stop checking it. The physical sequence makes the contrast easy to remember because the words match observable events. A short dramatization often teaches more than twenty blanks.
Remember doing versus remember to do
“I remember locking the door” describes a memory of an earlier action. “I remembered to lock the door” says I did not forget a duty before doing it. In one sentence the locking is remembered as an event; in the other remembering leads to the action. That distinction matters in instructions and stories where the sequence is important.
Likewise, “I forgot to bring my notebook” means I failed to perform the intended action. “I will never forget visiting that museum” describes a memorable past experience. In ordinary use, forget doing can refer to losing the memory of an event, though it is less common in some everyday contexts than remember doing.
Try doing versus try to do
“Try restarting the device” suggests experimenting with a possible solution. “Try to restart the device” highlights an attempt to perform an action, perhaps when it is difficult. If a teacher says “Try drawing a diagram,” the suggestion is a strategy; “I tried to draw a diagram, but the pencil broke” describes an attempted task that ran into a problem.
Go on doing versus go on to do
“She went on explaining the method” means she continued explaining. “She went on to explain the next method” moves to a subsequent action. In a talk, a speaker may go on discussing one example or go on to discuss a new example. The difference is whether the activity continues or the story advances to another one.
A small word with two identities: to is not always the infinitive marker
One common trap is “I look forward to meet you.” In standard English, say “I look forward to meeting you.” Here to is part of the prepositional phrase look forward to, and the following activity takes the -ing form. “I am used to waking up early” behaves similarly: to is a preposition, not an instruction to place a base-form infinitive after it.
Compare “I used to wake up early,” which describes a past habit, with “I am used to waking up early,” which describes familiarity or adaptation. These expressions contain almost the same words, but they do different jobs. Teach them as complete phrases rather than treating all instances of to identically.
A reliable check: can a noun naturally follow to in this expression? “I look forward to the concert.” “I am used to the noise.” That is a clue that to is a preposition here. It explains why a gerund-like -ing phrase can follow: “I look forward to attending the concert.”
After prepositions, an -ing form is often the natural choice
“She improved by practising regularly.” “He left without checking the door.” “They talked about visiting the museum.” These constructions use a preposition followed by an -ing form naming the activity. That makes them especially useful in essays that explain how something happened or what someone considered.
The rule is helpful but should not be exaggerated into “every -ing form after every small word is a gerund.” Identify the actual preposition and its complement. Also remember that a preposition can be followed by an ordinary noun: “She improved by practice” is less natural here than “She improved through practice”, but “She improved through regular exercise” uses a noun without any verb form at all.
The bare infinitive: why “can to swim” is wrong
An infinitive does not always carry to. After common core modal verbs — can, could, may, might, must, should, will, would — the next verb usually appears in its base form: “She can swim”; “We should ask”; “They might arrive.” Do not write “can to swim” or “should to ask”. For a fuller explanation of what each modal communicates, visit Modal Verbs.
Other patterns use a bare infinitive after an object. “Let me help” and “The coach made us repeat the drill” are normal active constructions. In a passive transformation the structure can change: “We were made to repeat the drill.” The point is to recognise the whole pattern rather than adding or deleting to at random.
The verb help is flexible in many contexts: “She helped me write the letter” and “She helped me to write the letter” can both be grammatical. An answer checker that refuses every alternative may teach a false rule.
Watching an action happen: the difference between the whole event and the middle
“I saw her cross the road” can present the crossing as a whole event. “I saw her crossing the road” emphasises that the activity was in progress when I saw her. This pattern occurs with perception verbs such as see, hear and watch followed by an object.
Neither sentence automatically proves exactly how many seconds the observer watched or whether they saw every step. The difference is viewpoint: one takes in the action as an event; the other focuses on its unfolding. Asking “What was the speaker watching?” is more productive than simply memorising labels.
Where the errors come from — and what to repair first
The first verb’s pattern is missing
“I enjoy to draw” often comes from overgeneralising the useful to-infinitive structure. Teach a handful of verbs with -ing and revisit them in personal sentences: “I enjoy drawing”; “I avoid rushing”; “I finished reading.” Avoid adding twenty more verbs before the student can reliably use five.
The student thinks every -ing form is continuous tense
“Walking helps me think” does not contain a present continuous verb. Walking names an activity as the subject. Contrast it with “I am walking” and ask which verb carries the tense. This diagnostic checks grammatical roles rather than surface spelling.
The student thinks to always signals an infinitive
“We look forward to see you” reveals a misunderstanding of the complete expression. Ask for a noun substitution, then restore the activity: “look forward to the visit” becomes “look forward to seeing you.”
A correct form changes the intended event
“She stopped to write” is grammatical. So is “She stopped writing.” If the intended story is that she stopped an activity so that she could write a note, the first is appropriate. If she put down her pen, the second is appropriate. Not all errors are about forms being ungrammatical; sometimes the selected construction tells the wrong story.
The three-question verb-pattern diagnostic
- What is the first verb or expression? Identify enjoy, decide, look forward to, stop or another governing pattern.
- What grammatical form is available? Does the pattern take -ing, to + base verb, a bare infinitive, or more than one form?
- What does it mean here? If both forms are possible, do they preserve the intended activity, memory, purpose or sequence?
This is a good task for a learner to do aloud. Ask them to explain “I stopped eating” versus “I stopped to eat” in their own words. If they cannot, adding more rules will not solve the underlying uncertainty. Return to a tiny scenario the learner can picture.
Gerund and infinitive exercises with answers
Choose the form that fits both standard grammar and the stated situation. These original questions include several meaning contrasts, so the answer key matters as much as the form.
- Enjoyment: “I enjoy (read / reading / to read) short mystery stories.”
- A decision: “They decided (visiting / to visit) the exhibition on Saturday.”
- Ceasing an activity: “The students stopped (chatting / to chat) when the lesson began.”
- Pausing another action for a purpose: “I stopped walking (checking / to check) the directions.”
- A memory of something already done: “I remember (meeting / to meet) our new coach last year.”
- A duty not to forget: “Remember (switching off / to switch off) the lights before you leave.”
- A suggested experiment: “If your notes are hard to follow, try (using / to use) a simple heading system.”
- A prepositional expression: “We look forward to (seeing / see) you next week.”
- After a modal: “She can (explain / to explain / explaining) the diagram clearly.”
- A past habit: “We used to (walk / walking) to school.”
Answer key: (1) reading, following enjoy; (2) to visit, following decide; (3) chatting, for ending an ongoing activity; (4) to check, for the purpose of pausing; (5) meeting, for a memory of an event; (6) to switch off, for a future duty; (7) using naturally suggests experimenting with a method, though try to use is also grammatical with a different emphasis; (8) seeing, because to is a preposition here; (9) explain, a bare infinitive after can; (10) walk, the base verb after the past-habit expression used to.
For the strongest practice, ask the learner to write a second sentence that uses the alternative form with a different meaning where possible. “Try to use a new heading system” could describe effort in the face of difficulty; “Try using a new heading system” more readily suggests an experiment. Explaining this distinction is evidence of mastery, not merely selecting a tick-box answer.
A 30-minute practice lesson that transfers into writing
Begin with five sentences from the student’s own work and identify the verb patterns. Spend ten minutes on common -ing and to-infinitive families, then ten minutes acting out or illustrating stop, remember and try in contrasting contexts. Finish by revising a paragraph with at least three real purposes: a preference, a plan and an event the narrator remembers. Ask the student to explain each selection without referring to a verb table.
In a three-student small group, one student can describe a scenario, the second write a sentence and the third interpret what happened. The group’s interpretation tests meaning directly. If the listener thinks the character stopped writing when the writer meant that the character stopped to write, the correction has a precise purpose.
For independent study, revisit the same pattern in a fresh context several days later. Learning continuity is visible when the student uses “I decided to practise” or “I enjoy practising” naturally in an unfamiliar explanation. Worksheet accuracy is useful but cannot alone establish transfer into real English.
Frequently asked questions about gerunds and infinitives
Is every word ending in -ing a gerund?
No. An -ing form may be part of a progressive tense or another construction. In ordinary school grammar a gerund is an -ing form functioning in a noun-like role, as in “Cycling is enjoyable” or “I enjoy cycling.”
Why can I say “I like swimming” and “I like to swim”?
Both are commonly grammatical. They can differ in nuance or context, but often overlap. The correct choice depends on the full sentence and what kind of preference the speaker is expressing.
Do infinitives always have to?
No. The base form after can in “She can sing” is a bare infinitive. The to-infinitive in “She wants to sing” has the marker to. Both are infinitival constructions.
Why is “I look forward to meeting you” correct?
Because to in look forward to is a preposition. A following activity is expressed with an -ing form. It is different from want to meet, where to marks an infinitive.
Does “stop to work” mean the same as “stop working”?
No. The first usually means a person pauses something else in order to work. The second usually means that the work stops. Ask what action ends and what action begins.
The core aim: keep intentions and events in the right relationship
Gerunds and infinitives help English express actions as activities, goals, memories, experiments, choices and purposes. Their core aim is not to perform a random alternation between -ing and to. It is to choose the construction that lets a listener understand which action is happening, intended, remembered or stopped. When that relationship becomes visible, the grammar begins to make sense.
For cross-checking and independent practice, use the British Council’s gerunds and infinitives overview and its meaning-change lesson, as well as Cambridge Grammar’s verb-pattern reference. Continue with eduKateSG’s Modal Verbs, English Grammar and English Learning Hub.