A passport is must to travel abroad.
In the above statement, what is must? Is it a noun, an adjective or a verb? Please give an example of how 'must' can be used as an adjective.
English Language & Usage Stack Exchange is a question and answer site for linguists, etymologists, and serious English language enthusiasts. It only takes a minute to sign up.Sign up to join this community
There are two words (nouns) you could use here :
In your case :
A passport is a must to travel abroad.
A passport is a must-have to travel abroad.
This means that a Passport is mandatory.
You could write that like this :
You "must have" a Passport to travel : Here "must" is a modal verb, while "have" is a verb.
You "should have" a Passport to travel : Here "should" is a modal verb, while "have" is a verb.
The meaning is unaltered.