A sentence fragment is a word group that pretends to be a sentence. Sentence fragments are easy to recognize when they appear out of context, like these:
When the cat leaped onto the table.
Running for the bus.
When fragments appear next to related sentences, however, they are harder to spot.
We had just sat down to dinner. When the cat leaped onto the table.
I tripped and twisted my ankle. Running for the bus.
To be a sentence, a word group must consist of at least one full independent clause. An independent clause includes a subject and a verb, and it either stands alone or could stand alone.
You can repair most fragments in one of two ways: