Academic Guides: Grammar: Run-On Sentences and Sentence Fragments (2024)

Run-On Sentences

A run-on sentence occurs when two or more independent clauses (also known as complete sentences) are connected improperly.

Example: I love to write papers I would write one every day if I had the time.

There are two complete sentences in the above example:

Sentence 1: I love to write papers.

Sentence 2: I would write one every day if I had the time.

One common type of run-on sentence is a comma splice. A comma splice occurs when two independent clauses are joined with just a comma.

Example of a comma splice: Participants could leave the study at any time, they needed to indicate their preference.
Sentence 1: Participants could leave the study at any time.

Sentence 2: They needed to indicate their preference.

Some comma splices occur when a writer attempts to use a transitional expression in the middle of a sentence.

Example of a comma splice: The results of the study were inconclusive, therefore more research needs to be done on the topic.
Sentence 1: The results of the study were inconclusive

Transitional expression (conjunctive adverb): therefore

Sentence 2: More research needs to be done on the topic

To fix this type of comma splice, use a semicolon before the transitional expression and add a comma after it. See more examples of this on the semicolon page.

Revision: The results of the study were inconclusive; therefore, more research needs to be done on the topic.

You can correct a run-on sentence by connecting or separating its parts correctly. There are several easy ways to connect independent clauses.

Academic Guides: Grammar: Run-On Sentences and Sentence Fragments (2024)
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