CNT UNIT 6 - Lesson 2

You look exhausted. You ___ stayed up so late last night.

• shouldn't have
• couldn't have
• wouldn't have
• might not have

Answer explanation

shouldn't have is the only option that expresses regret or a judgment about a past action that was a bad idea.

The roads were closed. He ___ driven to the office.

• couldn't have
• shouldn't have
• wouldn't have
• must not have

Answer explanation

couldn't have is used here to show that it was impossible for him to do the action in the past.

I don't know where she is. She ___ gone to the store.

• might have
• must have
• would have
• should have

Answer explanation

might have correctly expresses a possibility about a past action when you are not certain.

The lights are off and no one is answering. They ___ left already.

• must have
• could have
• would have
• should have

Answer explanation

must have is used to make a logical conclusion or deduction about a past event based on evidence.

I'm glad I saw that movie with you. I ___ loved it!

• wouldn't have
• couldn't have
• might not have
• shouldn't have

That concert was amazing! You ___ come with us.

• should have
• must have
• could not have
• would not have

Answer explanation

should have is used to express regret that something didn't happen; in this case, that the person did not come.

A new phone like that ___ an arm and a leg. I can't afford it.

• costs
• cost
• is costing
• will be cost

He didn't study for the exam, so he ___ been surprised that he failed.

• couldn't have
• shouldn't have
• wouldn't have
• might not have

If I had known you were in town, I ___ called you.

• would have
• must have
• should have
• may have

Answer explanation

would have is the correct modal to show the certain result.

Thanks for your advice. I will definitely ___ some thought.

• give that
• give it to
• make it
• make that