-- How many people are expected to come to your party tomorrow afternoon?-- I send out thirty invitations but one third _____.
—Has your father got up? —Sorry, I’m not sure. He __________ got up. Please go and see for yourself.
-You must say sorry to Mary, Jack. -Why ________ I say sorry to her? It’s her who hurt me first.
—Why didn’t you put your cellphone in your overcoat pocket? —I ________, but I was afraid it would be stolen.
—Is there a fog in the evening ? —There________be . I’ll make a phone call to find it out .
“Look at these tracks. It _______ be a wolf.” “Don’t be so sure. I think it _______ be a fox.”