主旨句英语怎么说

I like biology on the subject very much是一个错误的句子你可以说My favorite subject is biology.或者I like biology this subject a lot. 就可以了~我在学校里成绩一般，不过我知道我要更加努力Although my performance in school is ordinary, but I will study harder.或Although the grades of all my subjects are not so good, but I will study harder.

I like biology on the subject very much应该是一个错误的句子直接改成I like biology.我喜欢生物（生物学或生物课都可以）我在学校里成绩一般，不过我知道我要更加努力My performance in school is ordinary but I know I have to study harder

I like biology very much. 我非常喜欢生物。on the subject就某种课程。就课程而言我非常喜欢生物课。My grades is average in school, but I know i will study harder. Although my score is not very good, I know i will study harder.I am an ordinary student in school, but I will definitely study harder in the future.