What’s a Comma Splice?

This correctly punctuated sequence of sentences about the iPhone 4S is a perfect illustration of how you can avoid a comma splice:

Apple introduced its long-awaited new iPhone on Tuesday. But it wasn’t an iPhone 5. That will have to wait.

Those last two sentences would be incorrect if they were connected only with a comma:

Apple introduced its long-awaited new iPhone on Tuesday. But it wasn’t an iPhone 5, that will have to wait.

That sentence is a comma splice: two clauses, each of which could stand as an independent sentence, incorrectly joined with a comma.

When you have two clauses that could stand as independent sentences, you’ll always be safe if you use any of these other methods to join them:

A Semicolon:

Apple introduced its long-awaited new iPhone on Tuesday. But it wasn’t an iPhone 5; that will have to wait.

A Comma and a Conjunction:

Apple introduced its long-awaited new iPhone on Tuesday. But it wasn’t an iPhone 5, since that will have to wait.

A Semicolon, Linking Word, and Comma:

Apple introduced its long-awaited new iPhone on Tuesday. It wasn’t an iPhone 5; unfortunately, that will have to wait.

Or, of course, you could just make each independent clause its own sentence, as in the original example.

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