YOU SAID:
I dont like him because he is very fat
INTO JAPANESE
彼は非常に太っているので私は彼が好きではない
BACK INTO ENGLISH
I do not like him because he is very fat
INTO JAPANESE
彼は非常に太っているので私は彼が好きではありません
BACK INTO ENGLISH
I do not like him because he is very fat
That didn't even make that much sense in English.