Choose the right verb forms to complete the sentences.

Choose the correct option.

We [don't need buy|don't need to buy|needn't to buy] a book, our teacher will give us one.

You [didn't need tell|needed haven't told|needn't have told] Mary about the broken vase. She was so sad.

Jason [needn't to worry|needn't worry|doesn't need worry] about the cat. I have already fed it.

You [don't need go|don't need to go|needn't to go] to the doctor.