must and have to - for obligation, often quite similar, must V1 - for more personal opinions, strong advice, in formal writing, NOT very common in questions., have to V1 - when there’s an external obligation, more often in conversation, should V1 - for advice or opinions (you have a choice), don’t have to V1 - don’t need to do something (you can do it if you want), mustn't V1 - prohibition, shouldn't V1 - for negative advice, ought to V1 /ought not to V1 - = should/shouldn’t, although it is more formal, was/were able to V1 or managed to V1 - to say that someone did something in a specific situation, could V1 - to talk about a general ability in the past,

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