YOU SAID:
i think i'm gonna be sad, i think it's today
INTO JAPANESE
私は悲しくなると思う、今日だと思う
BACK INTO ENGLISH
I think i will be sad, i think today
INTO JAPANESE
私は悲しくなると思う、今日は思う
BACK INTO ENGLISH
I think i will be sad, i think today
That didn't even make that much sense in English.