work是可数名词也是不可数名词。work作“工作,劳动,作业”解时，用于泛指时不可数，指具体的一项工作时用不定冠词a修饰。work作“著作,作品”解时，多用复数形式works，可数名词。用作主语时，谓语动词可用单数形式，也可用作复数形式。
Now she won't have to go out to work any more.
现在她不必再出去工作了。
He would do well to concentrate more on his work.
他最好还是更加集中精力在工作上。
People tend to work hard at this stage of life.
人在这个人生阶段往往发奋努力。
They have been working on the perfection of the new model.
他们一直在努力完善新型号。
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