--- Whose French book is it?--- It __________ be Lucy’s. Look! Her name is on the book!

 Sir, you _______ be sitting in this sitting room. It is for women and children only.

--- The T-shirt with Michael Jackson’s picture ____ belong to Tom. He likes him a lot.---No, it ______ be his. He dislikes black colour.

—Where is Sally?—I’m not sure. She      in the library.

Delta, the American airline, is sometimes jokingly explained “Don’t expect your luggage to arrive” because it ______ be very slow.