— Must I finish my homework now, Mum?                        —No, you _____. You can do it tomorrow.

I am fond of my sister but she has one serious shortcoming. She _________ be really stubborn.

My sister met him at the street yesterday afternoon, so he __________ your lecture.

Without gravity, we _____ walk on the ground as freely as we do now. 

Tom, along with three other boys,     seen playing football a moment ago.