work hard at后面加什么

work hard at后面加名词 ，动词的ing形式；

work hard at

努力;努力做;努力做...;致力于；

work hard 努力工作

It is a demanding role and she needs to work hard at it.

那是一个要求很高的角色，她必须要加倍努力。

He\'s clever but he doesn\'t work hard at his lessons.

他聪明但不用功。

In this way, they may not work hard at their studies.

这样一来，他们可能就不会再努力学习了。

It\'s time that you should work hard at English.

你们应该努力学习英语了。

He must work hard at English, mustn\'t he?

他必须努力学习英语，是吧？

I have made up my mind to work hard at English.

我下决心努力学英语。