Trắc Nghiệm Về Can/Could

My grandmother ______ cook very well when she was younger.

• can

• could

• could have

• can't

He ______ help you with your project tomorrow if he's free.

• can

• could

• could have

• can't

You ______ been more polite to the waiter!

• can

• could

• could have

• might

They ______ hear strange sounds outside last night.

• can

• could

• could have

• can't

I'm not sure, but we ______ go camping this weekend.

• can

• must

• could

• will

Why didn't you come to the meeting? You ______ told me you were busy.

• can

• could

• could have

• might have

This road is very dangerous. You ______ drive fast here.

• can

• couldn't

• mustn't

• shouldn't

I'm so sleepy. I ______ sleep for 12 hours!

• could

• can

• could have

• must

That painting is beautiful! It ______ cost a lot of money.

• can

• must

• could

• can't

She ______ have forgotten her keys. That's why she can't get in.

• can

• could

• could have

• may