因为find是在couldn't的后面.could是can的过去式,couldn't是could not的缩写.
情态动词后面的实义动词要用原形.
could是过去式,在这里就表示出是过去发生的事情了.你回答的很好，再请教下，把couldn't换成doesn't可以吗？不可以。可以把couldn't换成didn't（注意过去时）
the boy looked for his toy everywhere,but he couldn't find it.
the boy looked for his toy everywhere,but he couldn't find it.
为什么是find不是found,因为前面是过去式啊looked for
为什么是find不是found,因为前面是过去式啊looked for
英语人气：872 ℃时间：2019-08-26 04:54:59
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