英语语法: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
相关内容：
省to 的动词不定式
动词不定式的否定式
语法：名词性wh-从句
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