hard work---繁重的工作，表示名词，一般是用来形容一件事情或工作；work hard---努力工作，表示动词，一般是用来形容人的。

扩展资料：

work hard造句示例如下：

（1）She complained that he did not work hard.

她抱怨他工作不努力。

（2）She is very tenacious and will work hard and long to achieve objectives

她是个锲而不舍的人，为了达到目标愿意长期苦干。

（3）The president will have to work hard to restore his credibility.

总统将不得不努力使公众恢复对他的信任。

（4）Everyone would have to work hard together to rebuild the economy

所有人都应该一起努力以重建经济。

（5）The Government will have to work hard to win back the confidence of the people

政府必须勤奋工作以重新赢得人民的信任。