hard work、work hard、hard working、working hard 有什么分别?

问题描述:

hard work、work hard、hard working、working hard 有什么分别?

hard work指难的工作 this is a hard work
work hard 指努力工作 everyone should work hard.
hard working指努力工作的,形容人.he is hard-working.
working hard表示进行时或者当主语