Have Done ことがあります
This is a very useful construction. Simply add it after a simple past form of a verb:
Construction:
Take the simple past form of a verb
Add ことがあります
アメリカに行ったことがありますか?
amerika ni itta koto ga arimasu ka?
Have you been to America?
納豆を食べたことがあります。
nattou o tabeta koto ga arimasu.
(I) have eaten natto before.
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koto
I was wondering if the こと in these two sentences can be written 事. Is it usually written with kana?