Modal Verbs must, have to, need (to)

I'm sure Ronald is at home. = Ronald ... be at home.

You aren't allowed to pick these flowers. = Tou ... pick these flowers.

It wasn't necessary for George to stay at work late last night, but he did. = George ... at work late last night.

It wasn't necessary for Alice to bake a cake for the party. = Alice ... a cake for the party.

It's forbidden to throw litter on the beach. = You ... throw litter on the beach.

It is your duty to obey the law. = You ... obey the law.

I can't go out. It is necessary to clean my room. = I can't go out. I ... clean my room.

I strongly advise you to speak to your parents about your decision. = You ... speak to your parents about your decision.

I'm sure Antonio is from Milan. = Antonio ... be from Milan.

It isn't necessary for Emma to attend tomorrow's staff meeting. = Emma ... attend tomorrow's staff meeting.