There’s someone studying at the library. A. It can ...

★ Modal Verbs of Deduction and Speculation

There’s someone studying at the library.

A. It can be David. I think he’s at home.

B. It can’t be David. I think he’s at home.

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My uncle is very strong. He can lift 300 kilograms!

A. He could exercise a lot.

B. He must exercise a lot.