Expressing necessity with the verb 'To have'

Followed by the infinitive, to have expresses necessity:
I have to work. I must work, I need to work.
The interrogative form is made using the auxiliary do/does/did:
He doesn't have to wear a suit. It's not necessary for him to wear a suit.
Does she have to read all this? Is it necessary for her to read all this?
To emphasize the idea of necessity, got can sometimes be added:
You've got to watch this movie! You really must watch this movie!

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