YOU SAID:

My Favorite Thing I have ever done

INTO JAPANESE

私が今までにやったことのある私の好きなこと

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My favorite things I've ever done

INTO JAPANESE

今までにやったことで一番好きなこと

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What I like most about what I've done so far

INTO JAPANESE

今までやってきたことが一番好きなこと

BACK INTO ENGLISH

What I like most about what I've done so far