我们英语书上有一句话是Someone saw him walk into that building at about three this afternoon.
问题描述：
我们英语书上有一句话是Someone saw him walk into that building at about three this afternoon.
为什么句中要用walk,而不用walking,有一句型不是see sb doing sth
答
两个都可以,但强调的不同.用walking强调的是看到他走进去的状态,用walk强调的是看到他走进去的事实.