YOU SAID:

i ate seven thousand sandwiches before I turned 14

INTO JAPANESE

私は14歳になる前に私は7000サンドイッチを食べた

BACK INTO ENGLISH

I ate 7,000 sandwiches before I was 14 years old

INTO JAPANESE

私は14歳になる前に私は7000サンドイッチを食べました

BACK INTO ENGLISH

I ate 7,000 sandwiches before I was 14 years old