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。

例句：

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。

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。

解析：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。

解析：本题强调其动作，正在河边玩，应此用see sb. doing sth句型。