A comma splice is a comma placed between two independent clauses without a coordinating conjunction. For example, “The train is late, I will walk” joins two complete thoughts with only a comma. Purdue OWL identifies this as a comma splice and outlines several repairs: separate the clauses, join them with a coordinating conjunction, use a semicolon, or make one clause dependent. [1]
Find two complete thoughts
Before revising punctuation, check both sides. “The train is late” has a subject and verb and expresses a complete thought. “I will walk” does too. Because each can stand alone, the comma is being asked to do more than mark a pause: it is joining two independent clauses without a connector.
A useful test is to replace the comma temporarily with a period. If both sides work as sentences, you may have a splice. The test is a prompt to inspect structure, not a rule that every comma between clauses is wrong: a coordinating conjunction can follow the comma and complete the link. Purdue’s guide distinguishes independent clauses from dependent ones. [1]
Four ways to revise one example
Start with this original example: “The bakery is closing, we should order now.” Both clauses stand alone. Choose a repair based on the relationship you want the reader to hear.
Use a period when you want two distinct statements: “The bakery is closing. We should order now.” Use a comma plus a coordinating conjunction when the second thought extends or contrasts with the first: “The bakery is closing, so we should order now.” The comma marks the boundary; so signals a consequence.
Use a semicolon when the clauses are closely related and you want them in one sentence: “The bakery is closing; we should order now.” Or make one thought depend on the other: “Because the bakery is closing, we should order now.” Now the first clause begins with because and cannot stand alone in that form. [1]
What a splice is not
A comma after an opening dependent clause is not a comma splice: “When the lights dimmed, the audience settled.” “When the lights dimmed” has a subject and verb but is incomplete, so it depends on the main clause. The comma separates the dependent opening from the independent clause rather than joining two complete thoughts.
A comma followed by a coordinating conjunction is also different: “The lights dimmed, and the audience settled.” Purdue’s quick guidance calls for a comma between independent clauses joined by one of the coordinating conjunctions and, but, for, or, nor, so, or yet. [1]
A repair exercise for a short passage
Consider this invented draft: “The library doors opened, I took the stairs, the reading room was still dark.” First, mark the three possible independent clauses: “The library doors opened,” “I took the stairs,” and “the reading room was still dark.” Each could be a sentence, so the commas alone splice them together.
One revision keeps the pacing brisk: “The library doors opened. I took the stairs, but the reading room was still dark.” A second gives the sequence a more continuous rhythm: “When the library doors opened, I took the stairs, but the reading room was still dark.” A third emphasizes the link between the first two: “The library doors opened; I took the stairs, but the reading room was still dark.”
Try the same procedure with your own draft: circle every comma, then inspect the words immediately before and after it. If both sides are complete independent clauses, add a suitable connector, replace the comma with stronger punctuation, or reshape one clause so it depends on the other.
Let the relationship guide the fix
There is no single repair that fits every splice. A period gives the ideas equal space but separates them. A conjunction makes a relationship explicit. A semicolon links close neighbors without spelling out the logic. A dependent marker such as because, although, or while places one idea in a supporting role. [1]
In dialogue, informal writing, or a deliberate literary voice, writers may bend punctuation conventions for a particular effect. In standard edited prose, though, use the structural test: if two complete independent clauses meet, provide a proper connection. That keeps a lively rhythm from obscuring how the ideas fit.
