All it can do is assure you that the person has look at the first screen .为什么can do是动词后还加上is这个动词,请赐教

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All it can do is assure you that the person has look at the first screen .为什么can do是动词后还加上is这个动词,请赐教

All it can do is assure you that the person has look at the first screen .为什么can do是动词后还加上is这个动词,请赐教
All it can do is assure you that the person has look at the first screen .
为什么can do是动词后还加上is这个动词,请赐教

All it can do is assure you that the person has look at the first screen .为什么can do是动词后还加上is这个动词,请赐教
这句话是这样的,all (that)it can do is .这样你懂了么?就是it can do是修饰all的从句,其中引导词 that 可以省略,因为从句中that不充当成分.

这句话有问题,is后面应该加to构成不定式作表语成分。而且has后面要么少了一个a,要么少了一个to。

is 前面是一个主语从句