He studies hard all the time, so he has made rapid progress in many ways.

他一直努力学习，所以他在很多方面都进步很快。

He studies hard enough.

他学得足够的好。

He studies hard and hopes to find a good job.

他努力学习，希望找到一份好工作。

He studies hard, so does Mary.

他学习很用功，玛丽也是这样。

That he studies hard is true.

他真得很努力学习。

That he studies hard is true.

他真的很努力的学习。

He studies hard to improve his maths.

他努力学习，提高数学成绩。

He studies hard and I study hard, too.

他学习用功，我(学习)也用功。

He is not very bright but he studies hard.

他并不聪敏，但是他很用功。

He studies hard.

他学习努力。

He studies hard at his subjects, so do you.

他努力学习各门课，你也是。

The more important, he studies hard. So do I.

更重要的是，他学习很努力，我也一样。

He studies hard in the classroom every morning.

他每天早晨在教室里认真地学习。

Because he studies hard, he gets good grades...

他学习努力，所以他取得了好成绩。

It will be to his advantage if he studies hard.

假如他努惫学习，就会对他有利。

He studies hard in order that he may pass the exam.

为了考试及格他学习很用功。

He gets on well with his classmates; he studies hard.

他与同学们相处很好，他学习刻苦认真。

Although he studies hard, he can't catch up with others.

虽然他努力学习，但他不能赶上别人。

If he studies hard, he will be able to learn English well.

如果他努力学习的话，他会学好英语的。

He studies hard lest he should fail in the next exam again.

他怕在下一次考试中再不及格，因而努力学习。

My son is not brilliant, but at all events he studies hard.

我的儿子并不怎么聪明，但不管怎样，他学习努力。

Unless he studies hard, he will never pass the examination.

他如果不努力学习，就永远不能考及格。(其实他就是不努力学习)。