“我很努力的学英语“用英语说

I learn English very hard

I am trying hard to learn English.

learn 和 study 不同的，这里用learn比较合适。
然后try my best是尽全力，相对也有一些不贴切~

I am trying very hard to study English.

上海灵格风英语

I learn English very hard.
I try my best to learn English.

I learn English very hard

I spend lots of energy on studying Engish.