|All clauses are not created equal. Independent clauses sound complete:
the train will arrive at three Dependent clauses seem to leave you waiting for more information:
when the train arrives . . . If you punctuate a dependent clause as a sentence (with a capital letter at the beginning and a period at the end), you have got a fragment. Independent clauses, on the other hand, can be punctuated as sentences.
Pass your mouse over the following clauses to see whether they are dependent or independent, and why: