限制性定语从句和非限制性定语从句最大的区别
非限制性定语从句只是对主句或主句中所出现的某个名词的补充说明和解释去掉对主句影响不大
限制性定语从句是主句当中不可缺少的一部分
Mr Smith was a famous person in American history.
Mr Smith who died on July 17th at 84,was a famous person in American history
There were very few passengers,who escaped without serious injury.
旅客很少，他们没有受到重伤都逃出来了。
There wer vey few passengers who excaped without serious injury.
没有受重伤而逃出来的旅客很少

The taxi drivers,who knew about the traffic jam,took another road.
所有司机都知道堵车的事，都走了别的路
The taxi drivers who knew about the traffic jam took another road,and others who didn't know about the traffic jam still took this heavy road.
得知堵车的司机走了别的路，不知道堵车事件的司机仍然走这条路

who引导的非限制性定语从句主要指人做主语
指代事物在非限制性定语从句当中只能使用which
He lent me a thousand dollars,which was exactly the sum I needed,
指代时间when、地点where
He was left on the desert island,where he stayed for as long as three weeks.

found: 建立　　set up  eatablish

live-lives

which指代friendly dogs
The panda,which was brought from China,was used as a symbol of friendship
Now that: 既然　　用做时间连接词，后面通常跟完成式
Now that you have left university,you have to find a job.
用做原因连接词时，后面时态不限
Now that you won't help me,I must do the job myself.

whoever,whatever,whenever,wherever,whichever,however
== no matter who/what/when/where/which/how
You can telephone me whenever you like.
Whichever day you come,we'll be pleased to see you.
Wherever you go,I'll follow you.
However busy you are,you must spare some time to study English.

Despite: 介词---in spite of
rashly: 莽撞的　　　attempt to do something --try to do something
there + be
There are still a few students studying English in the classroom.
in cars--by car
<I>about:</I> 到处，周围
Don't litter waste paper about.  look about  go about  run about
wander about
keep: 使某人或某物处于某种状态，经常和介词短语，形容词，分词（现在分词和过去分词）搭配使用，表示一种状态
Keep him out.   Keep him in.        Do keep the cat in the room
表示逻辑的主谓关系－－现在分词　　　I'm sorry to keep you waiting.
表示逻辑的动宾关系－－过去分词　The lamb was kept tight to a tree

quite the opposite.

prefer something to something
I prefer reading to doing nothing. 
The boy prefers apples to bananas.
prefer to do than do something
He prefers to read than do nothing

The regular visitors to BeiJing

Mike,who loves chess very much,enter for the game.

【Special difficulties】

1...what...
2...When...
3...Who...

【Multiple choice questons】

1...C...
be best known for = be famous for,众所周知

2...C...
the main advantage.

3...D...
occupation: 事业，undisturbed: 不受打扰的

Structure
4...d...
名词作表语，at, 介词短语作状语

5...a...
形容词或副词和enough to do 搭配
b选项错在so rash as to,You are so kind as to help me.

6...a...
with的复合结构形式
A large car,with its headlights on and its horn blaring,roared down the arcade.
With so many people around me,I fell happy.

7...C..
让某人做某事：let sb do

8...C...
泛泛的概念采取一般现在时

Vocabulary

9...b...
强调两者之间

10...a...
whenever=if ever: 无论什么时候，只要情况是如此
Whenever(if ever) you pour oil on water,it floats.
in case主要是讨论预防措施
You should insure your house in case there is a fire.

11...d...
drive

12...c...
wander

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