YOU SAID:

you should eat a potato while sitting on the couch

INTO JAPANESE

ソファに座ってじゃがいもを食べるべきです

BACK INTO ENGLISH

You should sit on the couch and eat potatoes

INTO JAPANESE

あなたはソファに座ってジャガイモを食べるべきです

BACK INTO ENGLISH

You should sit on the couch and eat potatoes