If I don't turn it in. Then I have to pay a late fee. If I don't turn it in , then I have to pay a late fee. The teacher who said that grades don't matter. The teacher who said that grades don't matter was only trying to make me feel better .
Some fragments are harder to spot than others.
Read your writing aloud. Doing this will help you hear incomplete sentences. As you read aloud, listen for the subject and verb. If you cannot hear both, you have a fragment on your hands.