Two things you should do and two things you shouldn't do when you go to your friend's house, One thing you should do when you have a headache, Three things good students have to do to improve their English, Two things you shouldn't do when you have a flu, Two thing a teacher has to do before class, Two things you must do and two things you mustn't do before going to bed, Three thing you don't have to do at the weekend.

Modals of obligation should/ have to/ must

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