我刚才看到他们正在操场上跑步．Isaw them runningon the playground just now．题目和参考答案——青夏教育精英家教网—

3．我刚才看到他们正在操场上跑步．
Isaw them runningon the playground just now．

分析 saw them running．

解答答案：saw them running．这里是说just now刚才的事情，用一般过去时，表示看见某人正在做某事用see sb doing sth，see的过去式是saw，他们用宾格them，跑步run的动名词running，故答案是saw them running．

点评 "see sb do sth"表示看到某人做某事了，强调看见谁做过什么事．如：I saw her clean the classroom．是说我看到她打扫教室了．（强调做过这件事）
see sb doing sth 表示看到某人正在做某事强调"看见某人正在做某事"如：I saw her cleaning the classroom．我看到她正在扫打教室（强调正在做某事）像see 这样的感官动词还有hear，feel，watch，notice （注意到）都可以跟do 或doing分别表不同的意思

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