Parents complain their children are behaving unreasonably _____children consider their parents to be old-fashioned.
“Did Jim come?” “I don’t know. He _______ while I was out.”
“Look at these tracks. It _______ be a wolf.” “Don’t be so sure. I think it _______ be a fox.”
“Show me your permit, please.” “Oh, it’s not in my pocket. It ______.”
“Is there a flight to London this evening?” “There _______ be. I’ll phone the airport and find it out.”
“You ______ your teacher for help. He is kind-hearted.” “Yes. A whole day _______.”