〜なくても/〜なくてもいい

About

Attach も to the negative て form (なくて) of a verb or adjective to express "even if not (verb/adjective)".

E.g. 食たべる → 食たべなくて → 食たべなくても

For nouns and な-adjectives, you can express "even if not (a noun/な-adjective)" by attaching も to じゃなくて or ではなくて (formal).

E.g. 学生がくせいじゃなくても

～なくても can be combined with いい ("good") to express that "it's okay if X isn't done/isn't the case", or to ask a question in the same fashion.

E.g. 食たべる > 食たべて > 食たべなくてもいい

Summary

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  Attach も to the negativeて form of い-adjectives or verbs to express "even if not (verb/adjective)"

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  Attach も to じゃなくて or ではなくて to express "even if not (a noun/な-adjective)"

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  Attach いい to なくて to say that "it's okay if X isn't done/isn't the case"