Modal verbs

A. Someone's at the door.

B. It's 7 o'clock, so it ________ be Mark. He usually comes back home at this time.

• can't

• must

A. I can't find my glasses.

B. You _________ have left them in the library.

• can't

• might

You _________ be hungry again! You've just eaten a pizza!

• can't

• could

You _________ be tired! You haven't done anything!

• can't

• might

He _________ be British. He has an American accent.

• could have been

• can't

Ron is a great player. He _________ have practised a lot when he was younger.

• must

• might

Sam couldn't find her keys. She _________ have lost them on her way home.

• couldn't

• must

You shouldn't have done it. You _________ have fallen!

• could

• must

Dad always wants to go to the same place. It _________ be a great restaurant.

• must

• might

A. Whose book is this?

B. It _________ be Lina's. She was studying for a test when I arrived.

• must

• couldn't