AC1-3 PAST MODALS

A: Did she pass her final exam?

B: Yes, she did. She ____ really hard since she passed with high score.

• must have studied

• might have studyied

• can't have studied

A: Ou boss doesn't look great after the meeting.

B: You are right. He's in a terrible mood. It ____ good.

• might have been

• can't have been

• mustn't have been

A: Sara ____ happy when she found out that she was being promoted.

B: Actually, she told me that she was really delighted.

• can't have been

• might have been

• must have been

A: I think Aliens built the Nazca lines.

B: Are you serious? They ____. There's no scientific research about it.

• can't have built it

• might have built

• must have built

A: Where's Carla? She's not answering her phone.

B: That's weird! She ____ the house yet. Her car is still outside.

• could have

• might have left

• can't have left

A: Why were there lots of people on Brazil street?

B: I think it ____ a car accident. I'm not sure.

• could have been

• must have been

• can't have been

A. I'm sorry but Samatha isn't here. She ____ the office.

B: Thanks! Tell her that Mr. Smith called, please.

• must have left

• could have leave

• may have left