---Did you notice someone enter the classroom just now?---Sorry, I didn’t. I _____ my lessons at that time.
—has your friend studied English? —Since 2001.
We each other since the year of 1948.
—Where is your father? —He to Australia on business.
—Bob,it’s getting cold.take a jacket with you? —All right,Daddy.
—What are you going to do this weekend? —I yet.