Used to express that something is morally wrong, inappropriate, or useless. Often appears in admonishments or when pointing out a mistake.
See also: いけない
You must not do such a thing.
Used in the pattern 〜てはいけません to express prohibition. This is a core grammatical usage.
See also: いけない
cannot go
Only when written 行けません
Literal negative potential form of 行く (to go). Rarely written with kanji except in this literal sense.
I have something to do tomorrow and cannot go.
Telling lies is wrong.
His illness is hopeless now.
You must not take pictures here.
いけません is the polite form used in formal or polite speech, while いけない is the plain form used in casual conversation.
Polite negative form of the verb いける (potential of 行く), which developed extended meanings of 'to be good/proper' and 'to be able to go'. The expression is now idiomatic.