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Grammar detail: ことはない

ことはない - there is no need to, never happens
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79 words
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plain present clause
+
ことはない
means
there is no need to ~, ~ never happens
じぶん
自分
を
せ
責
めることはない。
You don't have to kick yourself.
ね
寝
てしまったからといって、
わる
悪
く
おも
思
うことはないのよ。
There's no need to feel bad just because you fell asleep.
This construction is similar to ことがない, and in many cases they are interchangeable. ことがない is often used with a past form verb (to mean 'has not happened'), and it is less common to use は in this way.
If the clause containing こと~ない is itself the subject of a larger sentence, it would be preferable to use は:
きょうと
京都
に
い
行
ったことはないが、
なら
奈良
には
なんど
何度
か
い
行
った。
I've never been to Kyoto, but I've been to Nara several times.
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Kanji used in this grammar

自
ジ   シ   みずから self   
分
ブン   ブ   フン   わける to divide, to distinguish   わかる to understand   わかれる to be divided   わかつ to share, distribute   
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責
セキ   せめる to torture; to blame, accuse   
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寝
シン   ねかす to lay down   ねる to sleep, to lie down   
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悪
アク   オ   わるい bad   
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思
シ   おもう to think   
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京
キョウ   ケイ    capital   
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都
ト   ツ   みやこ capital city, metropolis   
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行
コウ   ギョウ   アン   ゆく    いく to go   おこなう to take place   
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奈
ナ    Nara   
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良
リョウ   よい good   
何
カ   なに    なん what?   
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度
ド   ト   タク   degree   たび occasion, time   
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