Comma splices are a type of comma error where a writer incorrectly uses a comma to connect two independent clauses in one sentence (also called a Run-on sentence).
Independent clauses contain a subject and verb. These clauses can function as complete sentences or can be joined together in one sentence with the correct punctuation. The following example shows a comma splice with two independent clauses:
I read the book for class, I thought it was well-written.
| Independent Clause 1 | Independent Clause 2 |
| Subject (I) + Verb (read) | Subject (I) + Verb (thought) |
In this example, the writer tries to “splice,” or unite, two independent clauses with a comma. To fix this error, choose one of these options:
Replace the comma with a period or semicolon.
I read the book for class. I thought it was well-written. (The period separates the two independent clauses.)
I read the book for class; I thought it was well-written. (The semicolon can join two independent clauses in the same sentence. A semicolon is a good option when linking two shorter independent clauses to avoid choppy sentences.)
Use a comma and conjunction.
Conjunctions are connector words, such as for, and, nor, but, or, yet, so.
I read the book for class, and I thought it was well-written. (Using “, and” allows the writer to link two independent clauses.)
Restructure the sentence.
I read the book for class and thought it was well written. (The sentence is restructured into one independent clause – I read the book for class – and one dependent clause – thought it was well-written. “And” can join these two clauses. No comma is needed.)
Source consulted: Upswing Writing Lab
Guide created by: C. Jones 3/3/2021
Revised by: B. McCoid 1/19/2024
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