If people who use knives and forks switched to chopsticks...

来源：学生作业帮编辑：神马作文网作业帮分类：英语作业时间：2024/11/14 12:08:53

If people who use knives and forks switched to chopsticks...这里的use不是动词吗?那switch为什么要用过去式呢?

这题有两个谓语动词：use和switch.但这两个动词不在同一个层级.who use knives and forks是定语从句,use是从句里的谓语；而switch是主句里的谓语.
从句是事实,主句是虚拟语气.
不明白的再问哟!请记得采纳,多谢!
再问：用虚拟语气我也搞不清啊，if clause和main clause分不清在这个句子里面。我在想为什么use用原型呢？用used可以吗？
再答：名词后面如果有一个“主语+谓语”，这个“主语+谓语”就是定语从句。这里的定语从句是who use knives and forks，意思是“（人）用刀叉”，这不是与事实相反的假设，所以用陈述语气。而主句的（If people switched to chopsticks...）的意思是“如果（用刀叉的）人们改用筷子”，这是一个与事实相反的假设，所以用了虚拟语气。就是用过去式来表示现在的事。

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