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。(强调"我看见了"这个事实)
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.　
A. playing　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。