从此以后，他开始认真学习。

Evermore, he began to study seriously.

老师劝告学生们认真学习。

The teacher advise the students to study hard.

老师规劝学生们认真学习。

The teacher advised the students to study hard.

从此，她开始认真学习。

Henceforth, she started studying diligently.

他认真学习，从而取得了好成绩。

He studies diligently, thus achieving good grades.

作为一个有责任心的学生，他总是认真学习。

As a conscientious student, he always studies diligently.

我答应，我将认真学习。

I promise I'll study hard.

我觉得，我该开始认真学习了。

I think I should get down to studying be carefully.

认真学习是学生们的职责。

It's duty for students to study hard.

我将继续认真学习韩语。

I will continue to conscientiously study Korean.