YOU SAID:

my name was kkatie when i was like 20

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20歳くらいのときの私の名前はカティでした

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My name was Katie when I was about 20

INTO JAPANESE

20歳くらいのときの私の名前はケイティでした

BACK INTO ENGLISH

When I was about 20 my name was Katie

INTO JAPANESE

私が20歳くらいのとき、私の名前はケイティでした

BACK INTO ENGLISH

When I was about 20 my name was Katie