You ___________________ throw rubbish on the street.
mustn't
She _____________ do his homework.
must
You ___________________ keep off the grass (no pisar el césped)
must
He _______________ go to school today.
mustn't
He _________________ do the washing up.
doesn't have to
You _________________ walk on the paths.
must
You ______________________ park here.
mustn't
You ____________________ drive slowly.
must
You ____________________ swim on the pond (estanque).
mustn't
We ________________ buy any eggs. We've got lots.
don't have to