YOU SAID:

Hey what are you doing with that red cardboard of yours

INTO JAPANESE

ねえ、あなたの赤いボール紙で何をしているの

BACK INTO ENGLISH

Hey what are you doing with your red cardboard

INTO JAPANESE

ねえ、赤いボール紙で何をしているの？

BACK INTO ENGLISH

Hey, what are you doing with that red cardboard?

INTO JAPANESE

ねぇ、あの赤いダンボールで何をしているの？

BACK INTO ENGLISH

Hey, what are you doing with that red cardboard box?

INTO JAPANESE

ねえ、あの赤いダンボール箱は何してるの？

BACK INTO ENGLISH

Hey, what's that red cardboard box doing?

INTO JAPANESE

ねえ、あの赤い段ボール箱は何をしているの？

BACK INTO ENGLISH

Hey, what's that red cardboard box doing?