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JLPT N5 · Requests, permission & prohibition

なくてもいい (naku temo ii)

~なくてもいい — “you don’t have to ~”

In short · Says that it is not necessary to do the action. Drop い from the nai-form, add なくても, then いい.
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Pattern

  • 動詞ない形(−い)+なくても+いい verb nai-form + なくてもいい

How to use it

靴を脱がなくてもいいです means you do not need to take off your shoes. It also reassures the listener.

How to form it

来る → 来ない → 来なくても. Change the final い of the nai-form to くても.

Not the same as てもいい

てもいい gives permission. なくてもいい says it is unnecessary. 食べてもいい and 食べなくてもいい differ.

Examples

  • 明日(あした)は来(こ)なくてもいいです。

    Ashita wa konakute mo ii desu.

    You don't have to come tomorrow.

  • 靴(くつ)を脱(ぬ)がなくてもいいです。

    Kutsu o nuganakute mo ii desu.

    You don't have to take off your shoes.

  • 今日(きょう)は宿題(しゅくだい)をしなくてもいいです。

    Kyō wa shukudai o shinakute mo ii desu.

    You don't have to do homework today.

Common mistakes

  • It is not a prohibition. It means “no need to,” not “don’t.”
  • The last part can be replaced with 大丈夫.

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