unit 2 语法归纳。
一、before，after，as引导的时间状语从句。
1. before “在。之前”引导时间状语从句，主从句的时态分别为：
2. after “在。之后”引导时间状语从句，主从句的时态分别为：
3. as 引导时间状语从句，1）“一边。一边。表示一个主语同时进行两个动作；
he jumps as he goes along。 他边走边跳。
2）“当。时候”，表示两个动作同时发生或者同时延续， 又可表示一个动作发生在另一个动作的持续过程中。
he was writing as i was reading。
the students were talking as the teacher came。
as i got on the bus，he got off。
3）“随着。表示一种动作随着另一种动作的变化而变化。
as the time went on， the weather got worse.
二、who 和whom的用法区别。
who 谁，做主语和宾语，whom 谁，做介词和动词的宾语。
但前面有介词时，只能用whom
with whom are you talking?
for whom are you waiting here?
who is your english teacher?
my friend who i hve mentioned before is conming here.
do you know whom i saw yesterday?
三、that，who 引导的定语从句。
定语从句是用来修饰名词或者代词的句子，起定语的作用。被修饰的名词或者代词叫做先行词，定语从句通常在先行词之后。引导定语从句的词叫做关系词。
1. 关系代词who的先行词为人，在从句中做主语或者宾语，作宾语时可以省略。
the old man （who）i visited yesterday is my teacher。
the man who is talking to our teacher is betty’s mother.
2. 关系代词that的先行词为物，在从句中做主语，宾语或者状语，做宾语或者表语可省略。
the bag that lies on the ground is hers。
china is a country that has a long history。
i will remember the old buildings（that） i visited in the village。
3. 先行词被序数词或者形容词最高级所修饰，或者本身是序数词、形容词最高级时，关系词只用that。
he is the second student that won the game。
she was one of the best students that graduated from beijing university last year。
3. 先行词既有人又有物时，关系词只用that。
i can remember well the persons the some pictures that i saw in the room。
练习：一、 用before，as，after 填空。
1. you must finish your homework __your father comes back.
2. he jumps __he goes along.
3. i found his pen___he had left
4it grew darker, it became colder.
二、 用that，who填空。
1. most students like the teachers __understand them well.
2. most of my classmates prefer loud music __they can dance to。
3. he is the first student __won the game.
4. is there anything __you want to buy in the shop?
5. people like clothes __can make them look young.
can remember well the persons and some pictures __i saw in shanghai。
三、用适当形式填空。
students like the teachers __who）understand them well.
2. the girl __who) is dressed in red is his sister.
3. butwho ) your puzzle should be about.
4. for __who) are you waiting？
5. with __who) you are taking ？
6. he is the famous writer __who) won the nobel prize.
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