Must not do
This pattern is used to indicate that something is prohibited or must not be done.
예문
無駄に時間を使ってはいけない。
You must not waste time.
ここで大きな声を出してはいけない。
You must not raise your voice here.
薬を適切に使ってはいけない。
You must not use the medicine improperly.
빠른 확인
시간을 낭비해서는 안 됩니다. (無駄に時間を使っ___はいけない。)