YOU SAID:
Potatoes are pillows, because
INTO JAPANESE
ジャガイモは枕になるから
BACK INTO ENGLISH
Potatoes become pillows
INTO JAPANESE
ジャガイモが枕になる
BACK INTO ENGLISH
potatoes as pillows
INTO JAPANESE
枕としてのジャガイモ
BACK INTO ENGLISH
potatoes as pillows
Come on, you can do better than that.