—        I know by what time you want the project to be done?—By the day after tomorrow.      you finish it on time?

—Look! The man at the gate        be our headmaster. He stands there every morning.—No, it        be him. He is holding a meeting in the office now.

---Could I have some snacks between meals, mum?---No, you __________.

—Do you know       ? —I’m not sure, maybe he is an artist.

— Who’s that man in our classroom? It ________ be Mr. Brown. He is much taller.— You mean the man in white? He is an exchange student from England.