В каждом случае обведи модальный глагол или структуру, которые подходят для той или иной ситуации. If he comes, he (сап/will be able to) help us.
Greg is talking to the head teacher: (May/Саn) I come in?
Greg is talking to his younger sister: (Can/May) you bring me an apple, please?
I (can may) skate but not very well.
Penny tried to open the door. One, two, three». No way. But at last she (could/was able to) do it.
Last Sunday I (must/ had to) work a lot.
You (neednot/shouldnot) clean the windows. They are not dirty/