YOU SAID:

One day when I did that did that thig

INTO JAPANESE

ある日、私はそれをやった

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One day I did it

INTO JAPANESE

ある日私はそれをやった

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One day i did it

INTO JAPANESE

ある日それをやった

BACK INTO ENGLISH

I did it one day

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いつかやった

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I did someday

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いつかやった

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I did someday