1) General obligation a) Have to b) Must 2) Personal obligation a) Have to b) Must 3) Not obligatory, not necessary a) Have to b) Must 4) It's obligatory a) Have to b) Must 5) You can do it if you want, but not obligatory a) Don't have to b) Mustn't 6) It's prohibited a) Don't have to b) Mustn't

English File preintermediate 7C Modals

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