All it can do is assure you that the person has looked at the first screen of the message.这句话中,is 后为啥还能用动词原形assure呢,至少也应该用to assure啊,

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All it can do is assure you that the person has looked at the first screen of the message.这句话中,is 后为啥还能用动词原形assure呢,至少也应该用to assure啊,

All it can do is assure you that the person has looked at the first screen of the message.这句话中,is 后为啥还能用动词原形assure呢,至少也应该用to assure啊,
All it can do is assure you that the person has looked at the first screen of the message.
这句话中,is 后为啥还能用动词原形assure呢,至少也应该用to assure啊,

All it can do is assure you that the person has looked at the first screen of the message.这句话中,is 后为啥还能用动词原形assure呢,至少也应该用to assure啊,
主语从句,像all.做主语时To可以省略,也就是说,本来是有to的、但是省略了,只能在这个句型里面用.