YOU SAID:

how did you know i was a young lad

INTO JAPANESE

私が若い若者だということをどうやって知ったのですか

BACK INTO ENGLISH

How did you know I was a young lad?

INTO JAPANESE

どうやって私が若者だと分かったの？

BACK INTO ENGLISH

How did you know I was young?

INTO JAPANESE

どうして私が若いと分かったのですか？

BACK INTO ENGLISH

How did you know I was young?