Modal Verbs: can/could, may/might, should/ought to

You ... try harder.

You ... take photographs here.

... I carry this bag for you?

You ... have been more careful.

... I make a phone call, please?

Tom ... walk. He's only six months.

I'm sorry, but you ... go out.

Where's your father? - He ... be in the garage.

Tom ... speak French, German and Italian.

I ... swim until I was ten.