YOU SAID:

your mom went to Japan, you've done this before haven't you?

INTO JAPANESE

あなたのお母さんは日本に行きました、あなたは前にこれをしましたね？

BACK INTO ENGLISH

Your mom went to Japan, did you do this before?

INTO JAPANESE

あなたのお母さんは日本に行きました、あなたは以前にこれをしましたか？

BACK INTO ENGLISH

Your mom went to Japan, did you do this before?