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为什么I know ants can smell things as well as dogs can.最后要加can

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为什么I know ants can smell things as well as dogs can.最后要加can
为什么I know ants can smell things as well as dogs can.最后要加can
这句话的意思是:我知道蚂蚁和狗一样嗅觉灵敏.从语法分析,主语是I,谓语是know,宾语从句是ants can smell things as well as dogs can.从宾语从句内部看,“as well as”意思是“和·····一样好”,是比较的意思,比较的双方不是ants和dogs两种动物,而是 ants can smell things和dogs can smell things,即两种动物都可以嗅东西这样一个事实.实际上,这个句子是按照习惯用法省略了dogs can smell things 的后面smell things 两个单词,因为这两个词和前面的重复.如果不加can,这个句子的语法就错误了,而且意思也模糊了.