what it has happened to to the forest for the USA in the las

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/11/07 15:31:18

what it has happened to to the forest for the USA in the last 350 years 为什么?

这句话有问题,因为：
1 多了一个to
2 应该用forest of the usa
3 最大的问题在于这句话不完整,首先一句完整的句子要有主语和谓语,但是这句话中没有谓语,what引导的成分叫主语从句,他所指代的内容是350年前美国森林所发生的事情,整个句子充当主语,但是后面什么也没有,所以这句话要使完整的话可以这样改动：what happened to the forests of the usa in the last 350 years made us aware of the importance of plants(350年前美国的森林所发生的事使我们意识到了森林的重要性)
4 如果你把这句话作为特殊疑问句,则不要上面的3,而把it去掉,根据句子的意思是主语发生在森林,而这句话提问的是主语,所以在特殊疑问句中当提问主语（疑问代词指代主语时）主语要省略,所以把it去掉,并加上上面的1,2两条这句话就对了.

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