YOU SAID:
Youre mom is fat like a cow.
INTO JAPANESE
あなたのお母さんは牛のように太っています。
BACK INTO ENGLISH
Your mother is as fat as a cow.
INTO JAPANESE
あなたのお母さんは牛のように太っている。
BACK INTO ENGLISH
Your mother is as fat as a cow.
That didn't even make that much sense in English.