The Comma Splice: The Mistake Almost Everyone Makes

If we had to choose one mistake that appears in student writing at every level, from A2 emails to C1 essays, it would be this one:

Two complete sentences, each with its own subject and verb, joined by a comma. In English this is called a comma splice, and teachers mark it every time.

Why it happens

In many languages, including Turkish, Spanish and Italian, a comma can join two closely related sentences without any problem. Learners transfer the habit. There's also a speaking reason: when we talk, we pause briefly between connected ideas, and a comma looks like a short pause.

English punctuation doesn't work like a pause, though. A comma alone is too weak to hold two sentences together.

Four ways to fix it

1. Use a full stop. Simple and always correct.

The hotel was lovely. The staff were very friendly.

2. Add a linking word (and, but, so, because, although).

The hotel was lovely, and the staff were very friendly.

3. Use a semicolon when the two ideas are very closely connected. It's less common in everyday writing but useful in essays.

The hotel was lovely; the staff were very friendly.

4. Make one part depend on the other.

The hotel was lovely, with very friendly staff.

The "however" version

A very common variation at B2 and above:

However is not a conjunction like but. It needs a full stop or a semicolon before it:

How to find comma splices in your own writing

Look at every comma. Read the words on each side. If both sides could be complete sentences on their own, you've found a splice. Then choose one of the four fixes above.

It takes a minute, and it's one of the fastest ways to make your writing look more accurate.