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She looks younger than she is.和She is younger than I.的区别?

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She looks younger than she is.和She is younger than I.的区别?
为什么第一个句子后面要用系动词,而第二个句子不需要.look 和is都属于系动词啊.
She looks younger than she is.和She is younger than I.的区别?
因为前面是将两个不同的成分进行比较.
1.She looks younger和She is young进行比较,
后面的is 不是与前面相同的look所以不能够省略.
如果是She looks younger than he(looks).就可以省略后面的那个looks
2.She is young和I am young进行比较.
同样都是be动词,所以是同一事物的比较,
后者可以省略动词
有问题继续问,
希望能够帮到楼主哈~