if there is no ...; if (one) doesn't have ...
Conditional form of ない, used to express 'if not' or 'without'. Often appears in negative conditional clauses.
If you don't have money, you can't buy anything.
If you don't have time, please contact me later.
expression, auxiliary
Used as an auxiliary after the negative stem of verbs and adjectives to form negative conditionals. Equivalent to 'if not' or 'unless'.
expression, auxiliary
Abbreviation of なければならない, expressing obligation or necessity. Common in casual speech and writing.
See also: なければならない
Unless you hurry, you won't catch the train.
If it doesn't rain, let's go for a walk.
I have to go now.
I must do my homework.