what are the differences between ないでもいい and なくてもいい?


Ive seen this sentence 強がら **ないでいい**.

I wondered Would there be any difference if i replaced it with 強がら **なくていい**?




強がらないで(も)いい and 強がらなくて(も)いい mean the same thing, and are interchangeable. More
generally, (し)ないでいい and (し)なくていい are always interchangeable. The former is
probably more common in informal settings, but both are perfectly natural.

(Of course, that is not to say ないで and なくて are always the same. See [these
search
results](https://japanese.stackexchange.com/search?tab=votes&q=%22%E3%81%AA%E3%81%84%E3%81%A7%22%20%22%E3%81%AA%E3%81%8F%E3%81%A6%22).)




強がらないで(も)いい and 強がらなくて(も)いい mean the same thing, and are interchangeable. More
generally, (し)ないでいい and (し)なくていい are always interchangeable. The former is
probably more common in informal settings, but both are perfectly natural.

(Of course, that is not to say ないで and なくて are always the same. See [these
search
results](https://japanese.stackexchange.com/search?tab=votes&q=%22%E3%81%AA%E3%81%84%E3%81%A7%22%20%22%E3%81%AA%E3%81%8F%E3%81%A6%22).)

