He also does well in his exams because he works very hard on his studies.

他的考试成绩也很好，因为他在学习上非常努力。

He works very hard at English.

他学习英语很巴结。

He works very hard at his studies.

他读书很用功。

He works very hard and stays healthy.

他工作非常努力并且保持健康。

Yao sucks even if he works very hard.

姚明吸即使他非常努力。

Although my father is very old he works very hard.

虽然我爸爸已经老了但他还是辛勤的工作着.

He works very hard so he hardly fails an exam.

他学习很认真所以几乎没有不及格。

Yeah, he has some important relation with above. In some way, he works very hard.

对呀，他和上面有些关系。再说，他工作也很努力。