感官动词 + doing/to do
感官动词 see, watch, observe, notice, look at, hear, listen to, smell, taste, feel + do 表示动作的完整性，真实性;+doing
表示动作的连续性，进行性
I saw him work in the garden yesterday.
昨天我看见他在花园里干活了。
I saw him working in the garden yesterday.(强调\"我见他正干活\"这个动作)
昨天我见他正在花园里干活。
典型例题
1. They knew her very well. They had seen her ___ up from childhood.
A. grow
B. grew
C. was growing
D. to grow
答案：A。因题意为，他们看着她长大，因此强调的是成长的过程，而非正在长的动作，因此用see sb do sth 的句型。
2. The missing boy was last seen ___ near the river.
文章来源：www.yangjiajiao.com
外教一对一
A. playing
http://www.yangjiajiao.com
B. to be playing
C. play
D. to play
答案A. 本题强调其动作，正在河边玩，应此用see sb. doing sth句型。
文章来源：www.yangjiajiao.com
因篇幅问题不能全部显示，请点此查看更多更全内容