3．我剛才看到他們正在操場上跑步．
Isaw them runningon the playground just now．

分析 saw them running．

解答 答案：saw them running．這里是說just now剛才的事情，用一般過去時，表示看見某人正在做某事用see sb doing sth，see的過去式是saw，他們用賓格them，跑步run的動名詞running，故答案是saw them running．

點評 "see sb do sth"表示看到某人做某事了，強調看見誰做過什么事．如：I saw her clean the classroom．是說我看到她打掃教室了．（強調做過這件事） 
see sb doing sth 表示看到某人正在做某事強調"看見某人正在做某事"如：I saw her cleaning the classroom．我看到她正在掃打教室（強調正在做某事） 像see 這樣的感官動詞還有hear，feel，watch，notice （注意到）都可以跟do 或doing分別表不同的意思

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