necessity | Grammaring

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Modals to express necessity / obligation: MUST, HAVE (GOT) TO, NEED, SHOULD, OUGHT TO, SHALL

Must refers to obligations which come from the speaker and may be directed at the speaker or the listener:

I really must give up smoking. (directed at the speaker)
You must keep this secret. (directed at the listener)

Need can behave either as a modal verb or as a main verb: