Where is jenny?I saw her ---- (walk) along the river.请解释为什么这里只能用walking不用walk什么时候用walk?

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Where is jenny?I saw her ---- (walk) along the river.请解释为什么这里只能用walking不用walk什么时候用walk?
Where is jenny?I saw her ---- (walk) along the river.请解释为什么这里只能用walking不用walk
什么时候用walk?

Where is jenny?I saw her ---- (walk) along the river.请解释为什么这里只能用walking不用walk什么时候用walk?
语法中,see sb.doing sth 是某人正在做某事,I saw her 的时候,是她正在做着某件事,这里是她正在沿着河走路,因为正在做的事,所以要用walking.see somebody do somthing 是我看到了这件事的整个过程,比如 I saw she send her child to school yesterday.我昨天看见她送孩子去上学.我目睹了整个事件

see sb. doing sth 看见某人正在做某事

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