Как по Английски будет надо

noun

Something that should not be overlooked or missed.

Примеры использования:

This video is a must for everyone

adjective

(of a male elephant or camel) in a condition marked by heightened aggression and unpredictable behaviour that usually occurs annually in association with a surge in testosterone level.

Примеры использования:

Two musth males competing for a female

combining form

Used to form adjectives and nouns denoting things that are essential or highly recommended.

Примеры использования:

A must-visit destination

modal verb

Be obliged to; should (expressing necessity).

Примеры использования:

You must show your id card

auxiliary verb

Used with the past participle of other verbs to form perfect tenses

Примеры использования:

I have heard that story before., "have we been invited?" "yes, we have.", he didn’t have a birthday…