Bob, where is Linda?—She be in the library, but I am not sure.

Excuse me, will the plane for Beijing within an hour?—I’m not sure. You can go to the Information Desk for help.

I hear a foreigner will come to our school. Do you know him ?—Yes, Edward, university student from Europe, will teach us art in his spare time.

Will your brother go for a picnic this Sunday?—- If I don’t go, ________.

What should we do now,Mr Clark?-Please turn to Page____and look at the____picture.