You _______________ swim in that river, is full of piranhas!!
I had a problem yesterday because I ___________ find my keys.
We are happy because we __________ do homework this weekend.
Passengers always ________________ show their passports at passport control.
She ____________ speak Spanish but she wants to learn.
We were on holiday last week, so I _____________ go to school.
I lost my train ticket so I _____________ buy another one.
couldn't
have to
can't
mustn't
didn't have to
had to
don't have to