MUST | Grammaring

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Main clause

We can use modals other than will in the main clause of a sentence in the first conditional:

Must, can't and couldn't + infinitive are used to express deductions about present events:

That child is really talented. His parents must be proud of him.
It's only 10 o'clock. He can't/couldn't be at home.

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)