〜なくてもいい

Meaning

〜なくてもいい means do not have to do or it is okay not to do. It tells someone that an action is not required.

Formation

Take the ない form, remove the final い, and add くてもいい. 行かない becomes 行かなくてもいい, and 書かない becomes 書かなくてもいい.

Usage

Use this pattern when giving permission not to do something, reducing pressure, or explaining that a rule is optional.

Nuance

This pattern often sounds relieving or kind because it tells someone they are free from an obligation. In polite speech, use 〜なくてもいいです.

Comparison

〜なければならない means must do. 〜なくてもいい means do not have to do. These two patterns are useful opposites in N4 grammar.

Common Mistakes

A common mistake is using the plain negative form alone. 行かないです only says you do not go, while 行かなくてもいいです means you do not have to go. Also, do not forget the くても part.