表示在做某事时用doing, 做过某事用do
如: see sb. doing sth. / see sb. do sth.
We saw her chatting with her neighbors. 我们看到她在和邻居聊天。
I saw him climb the tree yesterday. 我昨天看到他爬树了.
I saw him climb the tree yesterday. 我昨天看到他爬树了。
like
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