Which modal verb is used to tell someone that it ...

★ Modal and Auxiliary Verbs

Which modal verb is used to tell someone that it is a requirement that they do something?

A. might

B. may

C. should

D. must

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Identify the function of the modal verb in the following sentence: She can swim across the river.

A. Indicate ability or possibility

B. Denoting future possibility

C. Showing certainty

D. Expressing obligation