Some students even have no idea of they are studying, so they waste much time playing.
He paid for a seat, when he _________ have entered free.
—Do you know where David is? I couldn’t find him anywhere.—Well. He _________have gone far—his coat’s still here.
Helen _________ go on the trip with us, but she isn’t quite sure yet.
Mr. White _______ at 8:30 for the meeting, but he didn’t show up.
— Mum, I’ve been studying English since 8 o’clock. _______ I go out and play with tom for a while ? — No, I’m afraid not. Besides, it’s raining outside now.