Modals: have to - must - should (affirmative and negative)

I ...... study this weekend. It's my obligation as a student. (must-have to / should / mustn't)

You ...... feed the animals in the Zoo. It's forbiden! (must / mustn't / don't have to)

I ...... make my bed every morning. I know my parents need help at home. (don't have to / must-have to / should)

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