Unit 4 Discovering structures 非限制定语从句和As的用法（ppt课件）-2022新人教版（2019）《高中英语》必修第一册.pptx

1、及物动词后面无宾语，就用关系代词；不及物动词则用关系副词。Lets practice Ready?Go!1.The fire lasted for a whole night,which caused great damage.2.This note was left by Tom,who was here a moment ago.3.Yesterday Jimmy left for China,where he had stayed two years.4.We will put of the meeting until next week,when we wont be so busy.

2、5.Kate,whose sister I shared a room with when we were at college,has gone to work in Canada.归纳 1：含义、结构、关系词1.非限定性定语从句是对_或_的补充、解释或附加说明，是非必要信息，即使去掉，主句的意思依然完整。2.主句或先行词与从句之间一般用_。3.非限定性定语从句的关系代词用_，_；关系副词用_，不用that和why。4.关系词的选择与前面判断限定性定语从句中关系词的判断方法一致。主句内容先行词逗号隔开which，whowhom，whose,aswhen，where1.She said she

3、 had finished her work,which I doubted very much.2.The moon,which is about 384,400 kilometers away from the earth,creates many beautiful stories.3.I only have a sister,who works in a hospital.归纳 2：(1)关系代词指代_的内容时，用非限制性定语从句。(2)_指的是世界上独一无二的事物或专有名词时，用非限制性定语从句。(3)先行词指的是某人仅有的一个亲属时，用_。整个主句先行词非限制性定语从句1.As e

4、veryone knows,China is a country with a long history.2.She is a great hero,as is described in the report.3.He invited me to dinner,which made me very happy.4.This novel,which I have read three times,is very touching.归纳 3：(1)as和which在引导非限制性定语从句时，可代替整个主句,且在定语从句中都可以作_(句子成分)。(2)as和which引导非限制性定语从句时的位置不同:

5、as引导的定语从句可置于_，而which引导的非限制性定语从句不可放在_。主语和宾语句首、句中、句后句首，只能放在句中、句后1.Last Sunday,when it was raining all the day,he came to our city,where he received a warm welcome.2.Opposite is St Pauls Church,where you can hear some lovely music.归纳 4：(1)非限制性定语从句可以由关系代词或_引导。(2)但在非限制定语从句中，不可用关系代词 _引导。that关系副词when、where

6、As的相关用法的相关用法as引导定语从句主要用于两种情况：一种是限制性定语从句，先行词前有as，so，such或the same 修饰；一种是非限制性定语从句，其先行词是整个主句，即as指代整个主句的内容。（1）as引导限制性定语从句，先行词前有as，so，such或the same 修饰。当先行词前有as，so，such或 the same等修饰时，关系代词常用as，它在从句中作主语或宾语。Such people（as have made great contributions to the world）should be greatly respected.（作主语）You may tak

7、e as many chairs（as you need.）（need的宾语）My parents dont have so much money（as I want）（want的宾语）He made the same mistake（as you made in the last exam.）（made的宾语）特别提示在sosuch.that.引导的结果状语从句中，that不作任何成分，只起引导作用。要注意区别这两种不同的结构。They had such a fierce dog（that no one dared to go near their house.）他们家有一条凶狗，没人敢靠近

8、他们家。（that引导结果状语从句，在句中不作成分）the same后有时用that，它表示“同一个，就是那一个”，而the same as则表示“与一样”，但不是同一个。This is the same cell phone（that I lost yesterday.）这就是我昨天丢的那部手机。This is the same cell phone（as I lost yesterday.）这是与我昨天丢的手机一样的手机。（2）as引导非限制性定语从句，其先行词是整个主句。as可以引导非限制性定语从句，先行词就是整个主句，它在定语从句中作主语或宾语。它引导的从句可以位于主句前，也可以位于主

9、句后，还可以位于主句中间。（As everybody knows,）Shakespeare was a great English writer.（as在从句中作宾语）Tom is a brave boy，（as is described in the report.）（as在从句中作主语）（3）as引导非限制性定语从句时，常见的固定表达：as we all know 众所周知 as I can remember 正如我所记得的as often happens 这经常发生 as we expect 正如我们预料的那样as you see 这一点你明白as has been said befor

10、e 如前所述as is well known 众所周知as was expected 正如预料的那样as can be seen 看得出来as may be imagined 正如可以想象出来的那样as has been said above 如上所述as we can all see 正如我们都能看到的那样as is often the case 像常规那样as everybody can do 正像人人都能做到的那样as will be shown 正如所示1.Mr.Smith,_was my former teacher,retired last year.2.I want to be a fireman,_ uniform looked so cool.3.We took them into the tea room,_ I introduced the history of tea-making.4.Rome can be pricey for travelers,_ is why many choose to stay in a hotel.whowhosewherewhichNoImageNoImage