--- _______ I come back before 6 o’clock?---No，you _______．But you _______ be back later than 7 o’clock．

Go and do it right now, and you _____ have my help when in trouble.

—Who’s that over there, Is it Jane?—No, It ________ be Jane. She is ill in hospital today.

This book isn’t mine. ________can it be?

There ________ be any difficulty about passing the road test since you have practised a lot in the driving school.