–Would you be kind enough to help me with my homework at one o’clock this afternoon?-- . Will two o’clock be OK?
I don’t know if she _____, but if she ____ I will let you know.
He is very busy. I don’t know if he _____ or not tomorrow.
“What place is it?” “Haven’t you found out we _____ back where we ______?”
He has changed a lot. He _______ not what he _______.
Mr Smith ______ a book about China last year but I don’t know whether he has finished it.