Obligation (strong): have to go , must go , make someone go, Obligation (mild): should go , ought to go, am supposed to go, Lack of obligation : don't have to go, Prohibition (strong): mustn't go, can't go, am not allowed to go, Prohibition (mild): shouldn't go, oughtn't to go, am not supposed to go, Permission: can go, am allowed to go, may go, let someone go, Ability: can/ can't go, am/ am not able to go, manage/ don't manage to go,

B2, Grammar: Modal Verbs and Related phrases

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