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In the "ことがあります" construction about past experiences, when is "事" used, and
when is "こと" used?

The textbook used in class uses "こと":

> 六本木の おんせんに 行った ことがあります。

If it wanted to use "事" instead of "こと", it could have, as that kanji was
taught in the same lesson. (Lesson 5 of "Japanese for Busy People II", revised
3rd edition)

However, [Wiktionary](http://en.wiktionary.org/wiki/%E4%BA%8B) says that the
kanji form can be used, and "事があります" gets some hits in the Tanaka corpus on
jisho.org

When is "事" used, and when is "こと" used?
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2014-05-17T10:53:57.780
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2014-05-17T11:42:01.503
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question
grammar kanji hiragana
When is "事" used instead of こと for past experiences?
I believe those two (ことがある and 事がある) are the same construction in terms of
meaning and they only differ by the way こと is spelled.

こと used as a grammatical construction, like the one in the question, is more
often spelled using hiragana in modern Japanese.
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2014-05-17T11:05:05.917
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answer