YOU SAID:

this is the most stupid thing i have ever done

INTO JAPANESE

これは私がこれまで行った中で最も愚かなことである

BACK INTO ENGLISH

this is the stupidest thing I've ever done

INTO JAPANESE

これは私がこれまでにした中で最も愚かなことです

BACK INTO ENGLISH

This is the stupidest thing I've ever done.

INTO JAPANESE

今までで一番愚かなことだ

BACK INTO ENGLISH

It's the stupidest thing I've ever done.

INTO JAPANESE

今までで一番愚かなことだ

BACK INTO ENGLISH

It's the stupidest thing I've ever done.