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
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.

因为这里面说的是蚂蚁和狗的嗅觉是相同的，这里不管是蚂蚁和够都“可以”（can)有这么好的嗅觉，所以两个名词后都要加can.