YOU SAID:

I ate seven pieces of cardboard

INTO JAPANESE

ダンボール7枚食べた

BACK INTO ENGLISH

ate 7 cardboard boxes

INTO JAPANESE

ダンボール7箱食べた

BACK INTO ENGLISH

I ate 7 boxes of cardboard

INTO JAPANESE

ダンボール7箱食べた

BACK INTO ENGLISH

I ate 7 boxes of cardboard