小学生需要掌握的英语语法知识点：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。(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。