初中英语牛津版 (深圳&广州)八年级下册（2013秋审查）Unit 7 The unknown world授课ppt课件

这是一份初中英语牛津版 (深圳&广州)八年级下册（2013秋审查）Unit 7 The unknown world授课ppt课件，文件包含Unit7TheunknownworldPeriod3Grammar课件pptx、Unit7TheunknownworldPeriod3Grammar教案doc、Unit7TheunknownworldPeriod3Grammar学案doc、Unit7TheunknownworldPeriod3Grammar练习docx等4份课件配套教学资源，其中PPT共34页， 欢迎下载使用。

知识目标：学习连词as，since和because的含义和用法以及because f的用法。能力目标：主动探究，善于发现语言的规律并能运用规律举一反三。
Wrds review
landing site n.
Read and pay attentin t the wrds in red parts:
1.He is absent tday because he was n ne else saw these aliens, I refuse t believe lks strange as he lked at the wrd “EARTH”.
Adverbial clauses f reasn原因状语从句
Presentatin
Adverbial clauses f reasn tell us why things happen. We usually use because, as and since t start adverbial clauses f reasn.
Adverbial clauses f reasn原因状语从句
三、because, as 与since三者的区别：
We can als put the adverbial clause f reasn after the main clause.
引导的从句既可以位于主句的前面，也可以位于主句的后面。
★注意： 从句位于主句前面时，要用逗号与后面的主句分开。
如：We had t stay at hme because it was raining. = Because it was raining, we had t stay at hme.
Try t rewrite the sentences.
(1)I didn’t g because I was afraid. = Because .(2)Yu dn’t have t see him tday as yu are t busy. =As .(3)Since yu have finished yur wrk, yu can have a rest.= since .
I was afraid，I didn’t g
yu are t busy, yu dn’t have t see him tday
Yu can have a rest yu have finished yur wrk
（1）because
侧重主句，语气次于because，常表示稍加分析便能得出来的原因，或人们已知的事实，意为“既然，因为”，常置于句首。如：Since yu can’t answer the questin, I’ll ask smene else. 既然你能回答这个问题，我去问问别人。
as 引导的原因状语从句语气最弱，它所表示的原因只是附带说明的“双方已知的原因”，常译为“由于；鉴于”。可谓语句首或句末。如：As it is raining, we shall nt g t the z. 由于下雨了，我们不应该去动物园。
because 和 because f 的区别
如： I didn’t buy it because it was t expensive. He is here because f yu (that). They didn’t g t the museum because it rained. They didn’t g t the museum because f the rain.
because 是连词，后面接句子，构成表示原因的语从句； because f 是短语介词，后面接名词、名词性短语或动词-ing形在句子常用作状语。
Lk and say:
A: Why are yu late? B: I’m late because f _________________. I’m late because _________________.
the heavy traffic
the traffic is heavy
A: Why did yu nt g t wrk yesterday,Lily? B: I didn’t g t wrk because f ___________. I didn’t g t wrk because _________________.
my illness
A: Why was there n electricity this mrning?B: There was n electricity this mrning because f _________________________last night ./ because ___________________________ last night.
the heavy strm
the strm is very heavy
We can als use because f t give the reasn fr smething.
They went t the frest because f their curisity.Tina wke up at midnight because f a lud nise.She decided t explre the frest because f it.
Fill in the blanks with as, because r since:
1._________ yu d nt understand, I will explain again.2. ________ she was late fr schl, she had t say srry.. 3. __________ he was ill, he didn’t g t schl.
解析：考查原因状语从句连接词。1.2表示原因，语气较弱，1表示“既然”选用since，2表示“众所周知”的理由选用as；3表示直接原因，选用Because。
The plice fficer asked Tm sme mre questins abut the aliens. Match the questins with the answer. Then use them t cmplete the plice fficer's ntes with as, since r because.
1 （because）
Tina was sure that smething landed in the frest near the hills because she heard a lud nise last night.
Tina and I hid behind sme bushes as we heard sme vices speaking a strange language.
Because an alien saw us and made a terrible nise, we ran away.
Since n ne else saw these aliens, ur father refused t believe us.
1.He realized she was crying _____ what he had said. a. because b. because f2. I didn’t buy it ______ it was t expensive. a. because b. because f3. He lst his jb ______ his age. a. because b. because f4. He didn’t cme ______ he was ill. a. because b. because f
Chse the crrect answer:
Write sentences abut the stry n page 99 by using because f.
1 Tina was surprised/ the yellw light in the sky2 The alien landed n this planet/ an accident
Tina was surprised because f the yellw light in the sky.
The aliens landed n this planet because f an accident.
3 The children ran away frm the frest/ the aliens4 Their dad was nt sure abut the children's stry/ the writing n the piece f paper
The children ran away frm the frest because f the aliens.
Their dad was nt sure abut the children’s stry because f the writing n the piece f paper.
Pair wrk. Watch the vide and rle play.
Vicki：Jennifier，yu gt s many stamps.Jennifier：Yes. I like cllecting stamps because they are interesting.Vicki：I see. Since they are abut different cuntries, yu must like travelling a lt.Jennifier：Yu are right. It is my dream t travel arund the wrld.Vicki：That’s great. Oh, lk. It’s raining utside!Jennifier：Yeah. As it’s raining, let’s rder sme fd and eat inside.Vicki：Gd idea.
Adverbial clauses f reasn原因状语从句1. 定义：表示原因的状语从句。2. 引导词：because, since, as等。3. because, as 与since三者的区别。4. because 和because f 的区别。
Fill in the blanks with because, as, since r because f.
1. Mary didn’t g t schl yesterday___________ she was ill.2. ___________ everybdy is here，let’s begin ur games.3. ___________ yu are in pr health, yu shuld g t bed earlier.4. She didn’t cme, ___________ she was busy.5. ___________ all the passengers are here, why dn’t we start at nce?