YOU SAID:
I am going to go to school today
INTO JAPANESE
今日は学校に行きます
BACK INTO ENGLISH
I'm going to school today
INTO JAPANESE
今日は学校に行かない。
BACK INTO ENGLISH
I'm not going to go to school today.
INTO JAPANESE
今日は学校に行かない。
BACK INTO ENGLISH
I'm not going to go to school today.
That didn't even make that much sense in English.