Traduire en français des phrases contenant Can, Can't, Could, Couldn't et Be able toTraduction

Quelle est la traduction française de chacune des phrases suivantes ?

We can't come to your party.

When you were young, you could swim for hours.

When you are 18, you will be able to vote.

We weren't able to go to school yesterday, because the car broke down.

She can speak English fluently.