YOU SAID:

my potato is sat on my fat cats head

INTO JAPANESE

私のじゃがいもは太った猫の頭の上に乗っている

BACK INTO ENGLISH

my potatoes are on the fat cat's head

INTO JAPANESE

私のじゃがいもは太った猫の頭の上にあります

BACK INTO ENGLISH

My potato is on the fat cat's head

INTO JAPANESE

じゃがいもが太った猫の頭の上に乗っている

BACK INTO ENGLISH

A potato is on the fat cat's head

INTO JAPANESE

じゃがいもが太った猫の頭の上に乗っている

BACK INTO ENGLISH

A potato is on the fat cat's head