来源:深圳奥数网 2013-01-15 14:58:32
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。
关注奥数网官方微信 数学资料、数学真题、更有全国教育资讯 微信搜索“奥数网”或扫描二维码即可添加