YOU SAID:
I have biology tomarrow so i have to study.
INTO JAPANESE
私は勉強しなければならないので生物学 tomarrow があります。
BACK INTO ENGLISH
So I have to study biology tomarrow.
INTO JAPANESE
だから私は生物学 tomarrow を勉強しなければなりません。
BACK INTO ENGLISH
So I have to study biology tomarrow.
Well done, yes, well done!