〜ていては

About

The 〜ていては pattern is used to express that "if one keeps doing/always does X, Y negative consequence will occur".

The 〜ていては pattern is a combination of a ている form verb and the 〜ては conditional.

〜ていては is most commonly used in casual or polite spoken scenarios.

E.g. 暗くらい部屋へやで本ほんを読よんでいては、目めが悪わるくなりますよ。 "If you keep reading books in a dark room, your eyesight will get bad."

E.g. 他人たにんの目めばかり気きにしていては、やりたいことがやれないよ。 "If you always care about what others think, you won't be able to do what you want."

E.g. 心配しんぱいばかりしていては何なにも始はじまりませんよ。 "Constantly worrying won't accomplish anything."

Summary

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  〜ていては is used to say that "if one keeps doing/always does X, Y negative consequence will occur"

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  〜ていては is most commonly used in casual or polite spoken scenarios