文档介绍：Section B
知识要点
sb do sth. 看见某人经常做或强调做某事的全过程。
see sb. doing sth. 表示看见某个动作正在进行。
I saw him play basketball on the playground. 我看见他在打篮球了（强调这件事或他经常打）。
I saw him playing basketball on the （强调他正在打）。
典型例题：
When they went to into the park, they saw someone______ Chinese Kung fu.
A. plays B. played C. to play D. playing
答案：D
解析：当他们走进公园的时候，是一个时间点，所以用playing表示动作的进行。
part in 指参加群众性的活动或比赛。
I took part in the English speech competition 。
join指参加某一种组织成为其中一员。
My brother joined the army last year. 我哥哥去年参军了。
attend指参加会议，婚礼，听报告，翻译成“出席”。
Obama attended the important meeting. 奥巴马出席了这个重要会议。
典型例题：
More and more people are ______ some dangerous sports and activities.
A. take part in B. join C. attend D. taking part in
答案：D
解析：参加运动和活动，用take part in，而且前面有一个系动词are，所以选D。
in “主修”
He majored in English and management in Tsinghua University. 他在清华大学主修英语和管理。
典型例题：
Deng Yaping went to Tsinghua University and ______English and management.
A. majored in B. major in C. majored for D. major for
答案：A
解析：“主修”是major in, 而且这里要用过去时态。
随堂达标
一、单项选择
1. John learned to swim______.
A. when he were fourteen B. at the age of fourteen C. before he is fourteen fourteen
2. He is ______ unusual boy in his class.
A. a B. an C. the D. /
saw him ______football just now.
A. to playing        B. play       C. to