--- How old are you, madam?--- If you _______ know, I’m twice my son’s age.
I didn’t see her in the meeting room this morning. She ______ have spoken at the meeting.
They often go to the restaurants for meals. They _____ be very poor.
“Shall we go shopping?” “Sorry, we _______ buy anything now because none of the shops are open.”
I _______ have met him a long time ago. Both his name and face are very familiar.
“I called you yesterday. A woman answered, but I didn’t recognize her voice.” “Oh, it _____ my aunt Jean.”