Have to - Often describes obligations imposed by other people or authorities., Must - Used to talk about rules, regulations, or obligations that come from the speaker., Need to - Used to talk about things that are obligatory or necessary., Don't have to - Used to talk about things that are not obligatory or necessary., Don’t need to / Needn’t - Used to talk about things that are not obligatory or necessary., Mustn’t - Used to talk about prohibitions (things that are not allowed)., Can’t - Used to refuse permission or indicate something is not possible., Should / Shouldn’t / Ought to / Had better - Used to give or ask for advice and recommendations, Had better - Had better is stronger and used when we think something is a really good idea., Didn’t need to - Used to talk about things that were not obligatory or necessary in the past., Needn’t have + Past Participle - Used to talk about things that were not obligatory or necessary, but were done anyway., Wasn’t/Weren’t allowed to - Used to talk about past prohibitions., Couldn’t - Used to talk about things that were prohibited or not possible in the past., Should / Ought to + Have + Past Participle - Used to criticize or express regret about a past action,

Modals of Obligation, Prohibition and Advice - Rules

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