—- It ______ be hers. She sold her car yesterday.
—It __________ be him, for he _________ America.
— Yes, you _________.
—No, you_________. You can go out for a walk first.
—I'm not sure. He be playing football on the playground.
—It ______ be her. She has gone to Qingdao for a meeting.
—Sorry, I do it again.
—Oh, no. We cross the street until(直到) the traffic lights turn green.
— I'm afraid not. I ____ look after my grandmother because she is ill.
—It ________be her. She has gone to Beijing.