Meaning of なきゃならない in Japanese

I have to type in a really big document.

I must get my homework finished.

I have to burn the midnight oil tonight.

I might have to be very angry with you if you came alone.

The tar won't come off. I'm going to have to take this skirt to the dry cleaner.

And since she refused to accept it, she had been living in extreme discomfort, exclaiming: "Why should we spend all the capital we are ever likely to have tying ourselves down to a place we detest!"

This old suit is just about done for; I shall have to get a new one.

I have to catch that train.