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, could - Used to talk about hability in the past/ permission in a polite way, may - Used to talk about possibility., can - Used to ask for permission/talk about hability., ought to - Used to give and ask for advice. Similar to should and had better.,

Modal verbs 9o

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