It's important to study hard, but don't overdo it.

刻苦学习很重要，但不要超过极限。

If you study hard, you can make the roll of honour.

如果你努力学习，你就能上荣誉名册。

We study hard and play hard.

我们既努力学习又尽情地玩。

He could work hard and study hard.

他还可以一边努力干活，一边努力学习。

I begin to study hard from now on.

我从现在开始努力学习。