12-20 22:59:40 浏览次数:786次 栏目：初二英语辅导
八年级英语第三单元《What were you doing..》知识点整理
一、课文重点、难点、考点详解
1、what were you doing when the UFO arrived?
arrive 到达，后面接地点名词或是代词时，需要加上介词in 或at ，in 用于比较大的地方，at用于比较小的地方;
如果后面接here， there， home 等副词时，不加介词。如：
My pen pal arrived in Wuhan yesterday afternoon.
When did you arrive at Beijing airport?
He arrived home ten minutes ago.
2、getting out of the shouer
get out of 从……出来
3、what was the girl doing when the UFO took off?
take off 起飞，动身
Could you tell me when our flight will take off?
此外，take off 还作脱衣服，取下眼镜。
It‘s warm today， you had better take off your sweater.
4、I had a very unusual experience on Sunday.
experience n. 经历、阅历，可数名词，常用于词组：have /be a experience 有\是一次经历。如：
He had many interesting experiences while traveling in North America.
experience n. 经验、体验，不可数名词，对应的形容词为experienced 有经验的。如：
She is a teacher with rich experience of teaching.
experience vt. 经历、感受。如：
My father experienced great difficulty in giving up smoking.
5、I was walking down the street when a UFO landed right in front of me.
in front of 在……前面。如：
The car is in front of the house.
辨析：in front of and in the front of
in front of 表示某范围外部的前面。如：
There is a tall tree in front of the classroom
in the front of 表示某范围内部的前面。如：
There is a big blackboard in the front of the classroom.
6、She is shouting.
shout v. 喊，高呼，朝某人大喊
shout to. 指距离相隔很远而高声喊叫让人听见，无训斥之意。如：
She shouted to me to come over.
shout at. 表示生气时对某人大喊大叫，含责备、警告之意。如：
He tried to talk to the men， but they shouted at him.
7、While John was walking to school， he saw a cat in a tree.
辨析：in the tree and on the tree.
in the tree. 指外来的东西在树上，如人、动物等。如：
A boy is standing in the tree.
on the tree. 指树上本身长的东西，如花、果实等。如：
There are many apples on the tree.
www.170xue.com8、While she was talking on the phone， Davy met another dog outside the station.
another adj. 指另一、又一，常表示在原来的基础上增加，表泛指，直接接可数名词单数;如果与数词连用，后面接可数名词的复数。another + 数词+n. =数词+more +n.如：
I don‘t like this sweater， please show me another one.
Another three days passed
9、visited aunt in hospital
in hospital 生病住院，而in the hospital 表示在医院里。
He was badly ill， he must be in hospital.
She is a nurse. She works in the hospital.
10、While He Yan was at the doctor‘s， I was going to the class.
at the doctor‘s 在诊所。英语中习惯用名词的所有格表示该名词生活或工作的地方，像店铺、医院、教堂或某人的家等。如：
I am going to the barber‘s
11、This was one of the most important events in modern American history.
one of the +adj(最高级)+n(复数) 表示最…之一。
one of +n.pl 做主语的时候，谓语用单数。如：
One of us was late.
12、It was difficult to get out of bed.
it‘s + adj. for sb to do sth. 其中的形容词常为说明事物事情性质的词，像 difficult， easy， important， useful， impossible.etc. 如：
it‘s hard for me to work out the problem.
it‘s + adj. of sb. to do sth 其中的形容词常为说明人的性格特征或品质的词，像 nice， good， kind， foolish， polite， careless， etc.如：
it is very kind of you to say so.
13、 The boy was walking down the street when a UFO landed.
While the alien was buying a souvenir， the girl called the police.
when， while辨析：“当……时候”
(1) when当……时候，既可表示某一点时间，也可以表示某一段时间，引导的从句谓语多用终止性(瞬间)动词，主从句的动作可同时也可以有先后顺序发生。
I was just reading a book when she came into my room. 她走进我房间时，我正在看书。
(2) while正当……时，只能表示某一段时间，不能表示某一点时间。在while引导的时间状语从句中，其谓语动词只能是延续性的，而且也只能与主句中的谓语动词同时发生或存在。
While Jim was mending his bike， Lin Tao came to see him. 正当吉姆修自行车时，林涛来看他。
(3) 另外，when和while的区别还在于：while引导的时间状语从句多用进行时态，而when引导的时间状语从句多用一般时态。
While they were talking ， the bell rang. 正在他们谈话的时候，上课铃响了。
I was doing my homework when my mother came back home yesterday evening. 昨天晚上妈妈回家的时候，我正在做家庭作业。
二、语法详解
过去进行时：过去进行时表示过去某一时刻或者某段时间正在进行或发生的动作，常和表过去的时间状语连用，如：
I was doing my homework at this time yesterday.
过去进行时的构成：
肯定形式：主语+was/were+V-ing
否定形式：主语+was not (wasn‘t)/were not (weren‘t)+V-ing
疑问形式：Was/Were+主语+V-ing.
基本用法：
1.过去进行时表示过去某一段时间或某一时刻正在进行的动作。常与之连用的时间状语有，at that time/moment， this time yesterday at+点钟+yesterday ，when sb. did sth等时间状语从句，如：
What were you doing at 7p.m. yesterday?
I first met Mary three years ago.
She was working at a radio shop at the time.
，初二下册英语unit 3知识点总结tag: 知识点 英语 初二英语辅导，八年级英语辅导,初中英语学习方法，初中学习 - 初二学习 - 初二英语 - 初二英语辅导
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