Which of the following sentences uses a modal to express ...

★ Modal Probability

Which of the following sentences uses a modal to express a high probability in the past?

A. She must have forgotten her keys.

B. He might be at the store.

C. They can’t be serious.

D. You should call her.

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Which sentence correctly uses a modal to express a past impossibility?

A. She must have been there.

B. He might have been late.

C. They can’t have finished already.

D. You should have known.