He failed because he didn't study well.

他因为没有好好复习而挂科了。

As a student, your duty is to study well.

作为学生，你的职责是好好学习。

You must study hard if you want to study well.

如果你想学习好，你就得努力学习。

If you want to study well, you must study hard.

如果你想学习好, 你就要努力学习.

It's my duty to study well.

好好学习是我的责任。

Since I chose to study well.

既然我选择了要好好学习。

Wang Li doesn't study well as Wang Qian.

王丽不如王倩学习好是什么意思啊？

His father commanded that he should study well.

父亲命令他应该好好学习。

You study well; nevertheless, you seldom help others.

你学习好，然而你很少帮助别人。

I can do it. I do it well. I am a winner. I study well.

我能做到，我很好，我是赢家，我好好学习，我读的理解。