－ Whose is this blue bike?
－It ________ be Mary’s. Her bike is black and white.

－Mom, I’m leaving.
－It’s raining. You’d better ________ an umbrella with you.

– Must I clean up the classroom right now, Miss Green?
-- No, you ______.

--The man in a black suit _______ be our youth worker.
--- I’m sure it _______ be him. I saw him in the laboratory building some minutes ago.

— 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.

We can eat in the dining hall. But we _______ eat in the classroom.

—Mum, I can’t find my new pen.
—Don’t worry. It ____________in one of your pockets.

— Must we wear our school uniform this afternoon?
— No, you. All of us will go on an outing.

---May we leave the classroom now?
---No, you      . You       to leave until the bell rings.

It isn’t going to rain, so you        take an umbrella with you.