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Summary: Run-on sentences

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Run-on sentences are grammatical errors. They happen when you join two simple sentences without using either a co-ordinating or subordinating conjunction.

You cannot join two (or more) simple sentences using a comma only, or a comma with a connector that is not a co-ordinating or subordinating conjunction. Either use:

  • a co-ordinating or subordinating conjunction;
  • a co-ordinating or subordinating conjunction plus the other connecting word; or
  • leave them as two separate sentences.

Avoid exclamations and commands altogether in academic writing, and think twice about using questions.

You have completed Module 1, Unit 2: Run-on sentences.

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