Choose the right verb forms to complete the sentences.

Choose the correct option.

Sarah [doesn't need go|doesn't need to go|needn't to go] with us if she doesn't want to.

[Need I lock|Need I to lock|Do I need lock] the door?

Yesterday was our last day of school and we [didn't need to study|needn't have studied|needed haven't studied].

We [needn't to wash|don't need go|don't need to go] to the supermarket. There is enough food in the fridge.