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This question already has an answer here:

This is actually something I see from time to time :

もう生きてこの屋敷から出しはしない。

Why is it "出しはしない" instead of "出さない" ?

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marked as duplicate by l'électeur grammar May 19 '17 at 10:35

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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「...はしない」 is a stressed form of a negative form of a verb, or it just makes the sentence stronger.

出さない means in your sentence I'll not let you get/go out, while 出しはしない means I'll never let you get/go out.

Including your 出しはしない, I'll show you some examples as：

出｛だ｝す - 出｛だ｝さない - 出｛だ｝しはしない
食｛た｝べる - 食｛た｝べない - 食｛た｝べはしない
行｛い｝く - 行｛い｝かない - 行｛い｝きはしない
見｛み｝る - 見｛み｝ない - 見｛み｝はしない
聞｛き｝く - 聞｛き｝かない - 聞｛き｝きはしない
話｛はな｝す - 話｛はな｝さない - 話｛はな｝しはしない
触｛さわ｝る - 触｛さわ｝らない - 触｛さわ｝りはしない

I'll show you the way to make this kind of expression:

1) think of a ます-form of a verb:
行く ー> 行きます
2) omit ます from the ます-form of the verb; which is also called a stem form of the verb:
行き
3) add はしない to it:
行きはしない meaning (somebody will) never go. 　

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  • I see, so this is the "stem" form of a verb plus ～はしない。By "stressed form", you mean that it has the same meaning but it just makes the sentence stronger ? – Ushiromiya May 19 '17 at 10:35
  • @Ushiromiya: That's right. For example, 出さない means in your sentence I'll not let you get/go out, while 出しはしない means I'll never let you get/go out. – mackygoo May 19 '17 at 10:44
  • I see, I see. Thank you, it was really helpful. – Ushiromiya May 19 '17 at 10:45

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