Compound sentences are great because they give us a way to combine ideas and make our sentences more interesting.
Here are two ways that you can properly punctuate compound sentences.
1. Join the clauses with a semicolon.
When you diagram sentences with semicolons, join the clauses together with a dotted line and place an x on the line to represent the semicolon.
Some people prefer to draw a semicolon on the dotted line. Either one is fine.
The students wanted indoor recess; the teachers wanted outdoor recess.
2. Join the clauses with a comma and a coordinating conjunction.
Coordinating conjunctions are words that join things together. There are only seven coordinating conjunctions (for, and, nor, but, or, yet, so).
The students wanted indoor recess, but the teachers wanted outdoor recess.
Part 3: Finally... Comma Splices!
When independent clauses are joined by only a comma, we call them comma splices. Commas are not strong enough to hold two independent clauses together.
Here are a couple of examples.
The students wanted indoor recess, the teachers wanted outdoor recess.
My mother loves baking, she just made brownies.
Here are four ways you can avoid these.
1. Add a coordinating conjunction after the comma.
My mother loves baking, so she just made brownies.
2. Take out the comma and replace it with a semicolon.
My mother loves baking; she just made brownies.
3. Separate the two clauses into two sentences.
My mother loves baking. She just made brownies.
4. Put a colon between the two clauses if the second clause expands upon or clarifies the first clause.
My mother baked three different types of brownies today: she loves baking.
Are they ever okay?
You can use these for stylistic reasons if the clauses that they are connecting are short and parallel in structure.
They came, they saw, they left.
However, most people will see them as mistakes, so you should avoid them in formal writing.
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