dependent clauses

there is no point in worrying about things you can change. 

there is no point in going in a picnic if it's going to rain.

Hang in there, Martin! your invention is going to be a success.

you lost the previous match, but you have to hang in there to win again. 

If Perry calls

efore you leave town

Though it was not her job

 Although it was raining

after he finished his dinner

A dependent clause is a group of words with a subject and a verb. 

It does not express a complete thought so it is not a sentence and can't stand alone.

Jim studied in the Sweet Shop for his chemistry quiz.

She wants to travel the world and see wonderful sights.

The professor always comes to class fully prepared.

An independent clause is a group of words that contains both a subject and a verb. 

It expresses a complete thought and can stand alone as a sentence.