It is hard for an old man to work as long as a youngster 这里work 不用加s么为什么呢?

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It is hard for an old man to work as long as a youngster 这里work 不用加s么为什么呢?
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It is hard for an old man to work as long as a youngster 这里work 不用加s么为什么呢?
It is hard for an old man to work as long as a youngster 这里work 不用加s么为什么呢?

It is hard for an old man to work as long as a youngster 这里work 不用加s么为什么呢?
你所疑惑的是an old man 是第三人称单数,但是work 为什么不加s对嘛?是这样的.
因为an old man跟work不是直接相连的,就是说如果句子是an old man works as long as youngster这时work就必须变成works了.在你说的这个句子中,存在一个句型It is +adj+for somebody to do something,这里to 后面的动词就都必须是动词原形啦~