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A conjunction helps show how ideas belong together. Choose it by the relationship: an addition, a contrast, a reason or a result. A sentence can sound smooth yet express the wrong relationship if the connecting word has been guessed.
This Primary 3 guide uses short original examples with and, but, because and so. Parents can ask the child to explain the two ideas before joining them. The goal is purposeful sentence building, not a longer sentence for its own sake.
MOE's English Language Syllabus 2020 (Primary) frames grammar as supporting meaning across words, sentences and texts. This guide is original practice within that broader framework, not an exhaustive or mandatory P3 conjunction list. Follow the current school sequence.
Start with “Lina packed her book. Lina packed her pencil case.” Both statements concern what Lina packed. Joining them can avoid repeating her name: “Lina packed her book and her pencil case.”
Before adding a connector, ask whether both ideas are clear. A conjunction cannot repair an idea whose meaning is unknown. If the child does not know who “she” refers to, name the person first.
Keep the original meaning during sentence joining. Adding a word that changes the relationship is not merely a stylistic change; it may change what the reader understands.
“The pupils drew pictures and wrote captions.” The connector adds a second action. It does not by itself explain why the captions were written or set up a contrast.
Keep the joined forms compatible. “She enjoys drawing and reading” pairs two activities. “She enjoys drawing and reads” does not preserve that same structure cleanly in this sentence.
Do not join every sentence with and. Separate sentences are often clearer when the ideas belong to different parts of a story. Joining is a choice that should help the reader.
“The bag looked small, but it held many books.” The second idea contrasts with what the first might lead the reader to expect. The connector makes that contrast visible.
Compare “The bag looked small and it held many books.” This adds two facts without highlighting the surprising relationship. Both may be grammatically possible, but the intended meaning determines which is better.
Ask the child to name the contrast in plain words. Here the small appearance suggests limited capacity, while the large number of books challenges that expectation.
“Ravi stayed indoors because it was raining.” Staying indoors is the action; the rain supplies the reason. The word because introduces the reason, not the result.
The order can change: “Because it was raining, Ravi stayed indoors.” In this introductory pattern, a comma separates the opening reason clause from the main clause.
Avoid leaving “Because it was raining” by itself as the full answer in a sentence-writing exercise that requires a complete sentence. It leaves the reader waiting to know what happened because of the rain. Follow the actual task, especially where a short response rather than a full sentence is requested.
“It was raining, so Ravi stayed indoors.” The rain comes first, followed by the resulting action. Compare the earlier because sentence: the underlying relationship remains similar, but the connector introduces a different part.
Do not write “Because it was raining, so Ravi stayed indoors” in this standard construction. Choose either the because structure or the so structure. Adding both does not make the causal link stronger.
Read the sentence backwards as a check: Ravi stayed indoors because it was raining. If reversing the explanation produces nonsense, the cause and result may have been swapped.
Consider “Maya was tired, but she finished her drawing.” The contrast is between tiredness and continuing the task. “Maya was tired because she finished her drawing” expresses a different claim: finishing the drawing caused the tiredness.
A connector cannot be chosen only because it fits between two clauses. Ask what happened, which idea explains which and whether the relationship is actually supplied.
Use the punctuation convention taught in school. The examples here use commas between complete clauses joined with but or so. Do not insert a comma automatically before every and in a short phrase.
Choose a connector that matches the stated meaning:
- Addition: “We carried water ___ food.”
- Contrast: “The path was narrow, ___ we could walk along it carefully.”
- Reason: “Mei wore a jacket ___ the room was cold.”
- Result: “The room was cold, ___ Mei wore a jacket.”
Answers: 1. and. 2. but. 3. because. 4. so. The relationship labels make these practice choices clear; in an unrestricted sentence, other connectors might express a different meaning.
Now rewrite question 3 with the reason first: “Because the room was cold, Mei wore a jacket.” Keep the two ideas and their relationship unchanged.
Write two short sentences about a familiar event. Decide whether joining them would help. If so, name the relationship and choose the connector deliberately.
If the connector is wrong but both ideas are clear, practise comparing relationships. If the meaning is correct but the sentence is incomplete, inspect its clause structure. If every idea is joined into one long sentence, practise choosing where to stop.
Parents can ask, “Does this word add, contrast, explain or show a result?” The child is making progress when the answer describes the meaning rather than a guess about which word sounds best.