Colons and Semi-colons for Year 6

Colons and semi-colons are the punctuation marks that Year 6 children find most mysterious. They're not as common as commas or full stops, so children get less natural exposure to them. But they're actually quite straightforward once you know the rules — and they come up on the GPS paper regularly.

Colons: Introducing a List

The most common use of a colon is to introduce a list. The colon says “here’s what I mean” or “here they are”.

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Important: the part before the colon must be a complete sentence. You wouldn’t write “My favourite foods are: pizza, chips and pasta” because “My favourite foods are” isn’t a complete thought.

Colons: Before an Explanation

A colon can also introduce an explanation or elaboration. The second part explains or expands on the first.

She knew what she had to do: practise every single day.

The match was cancelled: the pitch was waterlogged.

Think of the colon as saying “because” or “which is”. If you could replace the colon with one of those words and the sentence still makes sense, you’ve used it correctly.

Semi-colons: Joining Related Clauses

A semi-colon joins two independent clauses (sentences that could stand alone) that are closely related in meaning. It’s stronger than a comma but weaker than a full stop.

It was raining heavily; the football match was cancelled.

Some children love maths; others prefer reading.

The key test: could each half stand alone as a complete sentence? If yes, you can join them with a semi-colon. If one half isn’t a complete sentence, use a comma instead.

Semi-colons in Lists

When list items are long or already contain commas, use semi-colons to separate them instead of commas. This prevents confusion.

The team included: Tom, the captain; Sarah, the goalkeeper; Amir, the striker; and Lucy, the defender.

This is less commonly tested in SATs but worth knowing for the higher-mark questions.

SATs-Style Example Questions

“Insert a colon in the correct place in this sentence: I have one rule for the classroom always try your best.”

I have one rule for the classroom: always try your best.

“Which sentence uses a semi-colon correctly?”

A) The sun was shining; brightly. WRONG (second part isn’t a clause)

B) She loved swimming; he preferred football. CORRECT

C) I need; eggs, flour and sugar. WRONG (should be a colon, not semi-colon)

Common Mistakes to Watch For

Using a colon where a semi-colon should go (and vice versa) — colon introduces something new (list or explanation); semi-colon links two balanced clauses.
Putting a colon after an incomplete sentence — “Such as: apples and oranges” is wrong because “such as” isn’t a complete thought.
Using a semi-colon when one half isn’t a full clause — both sides of the semi-colon must be able to stand alone as sentences.
Confusing semi-colons with commas — a comma splice (“It was cold, she wore a coat”) should use a semi-colon or a conjunction.

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