You ---------- be friendly to your grandparents. A. mustn't ...

[ Grammar ]

You ———- be friendly to your grandparents.

A. mustn’t

B. must

Select your answer:
A B C D E

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Verb Patterns Modals and Responsibilities Modal and Auxiliary Verbs Adverb of Frequency and Past Continuous Tense Preposition of Place Simple Present Continuous Tense Family Vocabulary Subject Verb Agreement Irregular Verb Simple and Continuous Tenses Zero Conditional Sentence

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