have to - to talk about things that are obligatory or necessary, often imposed on us by other people and authorities., must - Used to talk about rules, regulations and obligations., mustn't - Used to talk about prohibitions, need to - Used to talk about things that are obligatory or necessary., needn't - Used to talk about things that are not obligatory or necessary. With this modal verb, we don't use "to" before the infinitive., can't - Used to refuse permition., Ought to - Used to give and ask for advice. Similar to should and had better.,

Modal verbs T4

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