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问题: 单句改错3

改正并给出理由!
It is known to us all , the earth is smaller than the sun.

解答:

两种改法如下:
1,It is known to us all that the earth is smaller than the sun.
2,As is known to us all , the earth is smaller than the sun.
第一种改法是,用It作形式主语,代替后面的that主语从句。也就是原句子可以写成that the earth is smaller than the sun is known to us all。
第二种改法是,As引导非限制性定语从句,它代替后面的整个一句话的内容。翻译成汉语就是‘正如我们都知道的,地球比太阳小’。