--______ is your father? Does he still work as an engineer? --Yes, he has been an engineer for thirty years.
—Is Jack on duty today?—It __________ be him. It’s his turn tomorrow.
As you worked late yesterday, you __________ have come this morning.
— Must he come to sign this paper himself?— Yes, he __________.
If it were not for the fact that she __________ sing, I would invite her to the party.
— What’s the name?— Khulaifi. __________ I spell that for you?