I saw a boy fall off a bike,这句话saw用了过去式,为什么fall不用?

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I saw a boy fall off a bike,这句话saw用了过去式,为什么fall不用?
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I saw a boy fall off a bike,这句话saw用了过去式,为什么fall不用?
I saw a boy fall off a bike,这句话saw用了过去式,为什么fall不用?

I saw a boy fall off a bike,这句话saw用了过去式,为什么fall不用?
see sb.do sth 固定句型,do要用动词原形
还有一个句型see sb.doing sth,是看到了整个过程
祝你更上一层楼,有不懂的可以再问哦

see sb do sth ,看到某人做了某事,后面接原型,是个固定用法

see sb. do sth看见某人做了某事 固定搭配

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