小学英语语法备考指南：特殊词精讲（五）
小学英语语法备考指南：特殊词精讲（五）begin(start) doing/to do
begin / start to do sth
begin / start doing sth。
1) 谈及一项长期活动或开始一种习惯时，使用doing。
How old were you when you first started playing the piano？ 你几岁时开始弹钢琴？
2) begin， start用进行时时，后面动词用不定式to do
I was beginning to get angry. 我开始生起气来。
3) 在attempt， intend， begin， start 后接know， understand， realize这类动词时，常用不定式to do。
I begin to understand the truth. 我开始明白真相。
4) 物作主语时
It began to melt。
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。
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