感官動詞 see， watch， observe， notice， look at， hear， listen to， smell， taste， feel + do表示動作的完整性，+doing 表示動作的進行性。例如：

I saw him work in the garden yesterday. 昨天我看見他在花園里干活了。（強調"我看見了"這個事實）

I saw him working in the garden yesterday.（強調"我見他正干活"這個動作）昨天我見他正在花園里干活。

典型例題

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.因題意為，他們看著她長大，因此強調的是成長的過程，而非正在長的動作，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 playingC. playD. to play

答案A. 本題強調其動作，正在河邊玩，應此用see sb. doing sth句型。