[ Expressing Obligation and Modals ]
We use must/mustn’t to express:
A. obligation or duty, very strong advice, prohibition
B. prohibition
C. necessity
D. lack of necessity

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Modal Verbs › ViewYou ___________ use the phone in the class!
A. mustn’t
B. shouldn’t
C. may not
D. don’t have to
Modals Tenses › View
Media.ge …. contact First Stereo Management yet.
A. has not been able to
B. wasn`t able to
C. is not able to
D. will not be able to
