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Year 3

Using the comma rule in compound sentences

You can use the comma before "but" or "or" co-ordinating conjunctions in a compound sentence.

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New
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Year 3

Using the comma rule in compound sentences

You can use the comma before "but" or "or" co-ordinating conjunctions in a compound sentence.

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Lesson details

Key learning points

  1. A group of words that contains a verb and makes complete sense is called a main clause.
  2. Co-ordinating conjunctions join two main clauses to form a compound sentence.
  3. If the co-ordinating conjunction "but" or "or" is used, there must be a comma before it in a compound sentence.
  4. The comma tells the reader where the main clause demarcation is.
  5. Different co-ordinating conjunctions have different meanings.

Keywords

  • Main clause - a group of words that contains a verb and makes complete sense

  • Co-ordinating conjunction - a word that joins two main clauses to form a compound sentence

  • Compound sentence - a sentence formed of two main clauses and a joining word

  • Comma - a punctuation mark used before "but" or "or" co-ordinating conjunctions in a compound sentence

Common misconception

Pupils add a word after the co-ordinating conjunction not a main clause.

A co-ordinating conjunction in a compound sentence must join two complete main clauses. Any main clause must make complete sense.


To help you plan your year 3 english lesson on: Using the comma rule in compound sentences, download all teaching resources for free and adapt to suit your pupils' needs...

Use plenty of oral examples of main clauses to help pupils hear that a main clause makes complete sense.
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This content is © Oak National Academy Limited (2025), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

Lesson video

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6 Questions

Q1.
What is a main clause?
a letter or group of letters at the end of a word which creates another word
a group of words with no verb
a sentence starter followed by a comma
Correct answer: a group of words that contains a verb and makes complete sense
Q2.
How many main clauses are most often in a compound sentence?
Correct Answer: two, 2, too, to, at least two
Q3.
What type of conjunction joins two main clauses in a compound sentence?
subordinating conjunction
formal conjunction
Correct answer: co-ordinating conjunction
Q4.
Which of these are co-ordinating conjunctions?
as
Correct answer: but
when
Correct answer: and
Correct answer: or
Q5.
Match the co-ordinating conjunction to its purpose.
Correct Answer:and,for building on
tick

for building on

Correct Answer:but,for a positive and a negative
tick

for a positive and a negative

Correct Answer:or,for an option or an effect
tick

for an option or an effect

Q6.
Which co-ordinating conjunction would be best to link these two main clauses? You must take a raincoat __________ you will get wet.
and
Correct answer: or
but

6 Questions

Q1.
Which co-ordinating conjunction is best to join these two main clauses? Human stomachs contain acid __________ it is a safe acid.
or
and
Correct answer: but
Q2.
Which punctuation mark do you need before "but" and "or" co-ordinating conjunctions?
Correct answer: comma
exclamation mark
full stop
question mark
Q3.
How many main clauses are usually in a compound sentence?
1
Correct answer: 2
3
4
Q4.
Which co-ordinating conjunction is best to join these two main clauses? I love eating Italian food __________ I also enjoy Turkish dishes.
or
Correct answer: and
but
Q5.
What type of sentence is formed of at least two main clauses joined with a co-ordinating conjunction?
simple
Correct answer: compound
complex
Q6.
Which co-ordinating conjunction does not need a comma before it?
but
or
Correct answer: and