初中英语Unit 7 The unknown world示范课ppt课件

这是一份初中英语Unit 7 The unknown world示范课ppt课件，共28页。PPT课件主要包含了desert，lake，mountains，town，trees，land，kill，原因状语从句，because用法，why等内容，欢迎下载使用。

Perid 2 Listening & Grammar
Rescuing the lst astrnauts
Tw astrnauts, Liz and Gus, are lst n Planet X. Their captain Try is talking t them frm the mther ship.
A Listen t the captain’s instructins and help Liz and Gus label the map with the wrds frm the bx.
landing site
B. Listen t the recrding again and cmplete the ntes belw. Write ne wrd in each blank.
in tw days
leave mst things
five things
A Adverbial clauses f reasn
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)原因状语从句通常用于说明事情发生的缘由，常见的引导原因状语从句的从属连词有because, as, since等。
时态：原因状语从句一般都是根据实际情况选用适当的时态。 通常是主过从过，主现从现。
具体来说：★because语气最强，可以位于句首或句中，表示直接的原因，强调他人未知的事实。回答why提出的问题时，通常用because引导的句子来回答。如：
---Why d yu stp there, Eddie?---Because I have fund smething mre pleasant than art.
★ 表示明显或已知的理由时，通常用as/since引导原因状语从句，二者语气比because弱。如：Yu dn’t have t see him tday as yu are t busy. 由于你太忙了，今天就没必要去看他了。Since yu have finished yur wrk, yu can have a rest. 既然你已经做完了你的工作，那就休息一下吧。
We can als put the adverbial clause f reasn after the main clause.
★because因为/since既然/as由于引导原因状语从句时，既可以放句首，也可以放句中。
The plice fficer asked Tm sme mre questins abut the aliens. Match the questins with the answers. Then use them t cmplete the plice fficer's ntes.with as, since r because.
Tm and Tina hid behind sme bushes as they heard sme vices speaking a strange language.
Tm ran away because an alien saw them and made a terrible nise.
Tm’s father refused t believe him since n ne else saw these aliens.
B because f
We can als use because f t give the reasn fr smething.
(1)because“因为”表示直接的原因或理由，语气最强，通常放在主句之后，有时也放在主句之前。I stayed at hme because it rained.(2)回答why提出的问题，只能用because。 — Why didn’t yu call me last night? — Because I didn’t want t disturb yu. (3)because(因为)和s(所以)不能一起使用。 Because it was raining, we stayed at hme. =It was raining , s we stayed at hme.
1.because引导的从句可用于强调句，其余不能。 It’s because he is kind that we like him. 2.because从句可用作表语(be动词后)，其余不能。 This is because the earth is traveling arund the sun. 3.表示“……的原因是因为……”这一意义时，一般要用The reasn why…is that… The reasn why he cannt cme is that he is ill. 他不能来的原因是他生病了。
一般表示对方已知的、无须加以说明的既成事实的理由，全句中心在主句，语气比because弱，常译为“既然”。引导的从句常放在句首。
Since yu are free tday, yu had better help me with my math. 既然今天你休息，你最好帮我补习数学。
注意：since可用于省略句，而其它不能。如： Since s, there is n mre t be said.
1. _______ he takes exercise every day, ______ he is very healthy. A. Because; s B. Althugh; but C. Because; / D. Althugh; /2. — What shall we d this afternn? — _____ it’s very cld, let’s stay at hme. A. While B. Since C. Until D. After
as 引导的原因状语从句时表示附带说明的“双方已知的原因”，语气比since弱，较为正式，位置灵活（常置于主句前）。
As it is raining, yu’d better take a taxi. 既然在下雨， 你最好乘出租汽车。I went t bed early, as I was exhausted. 我睡得早， 因为我筋疲力尽了。
1. ______ yu are leaving tmrrw, we can eat dinner tgether tnight. A. Fr B. Since C. Befre D. While2. _____ the weather was fine, I pened all the windws. As B. Because f C. Fr D. With
1. because 意为__________2. because 语气_______, 表示________（直接r间接）原因3. because 常用来回答__________引导的疑问句。4. because 常放在_______。
注：because不能与s连用。
since 意为____________________, 表示对方已知的事实或显然的理由, 语气比because_____, 引导的从句常放在_________。2. as 意为___________，表示明显的原因或已知的事实，语气比since _______, 引导的从句常放在________。
注：since与as用法大致相同, 且都不能与s连用。
用 because , since和as填空I didn’t g t schl yesterday ________ I was ill.2. ________ everybdy is here , let’s begin ur meeting.3. ________ yu are in pr health, yu shuld nt stay up late.4. I asked her t stay nearby __________ I had smething t tell her .5. ________ all the passengers are here, why dn’t we start at nce.6. Bill wn’t make any prgress __________ he desn’t study harder than befre.
如：I was late because the traffic was heavy. 因为交通拥挤，我迟到了。= I was late because f the heavy traffic.He can’t g t schl because f illness.他因病不能上学。= He can’t g t schl because he is ill.
★有时because和because f可以相互转换。
because; because f1. He walked slwly ___________ his bad leg. 2. _______ I dn’t cmplain, the manager thinks I’m pleased with their service.3. All flights have been put ff ___________ bad weather.
Write sentences abut the stry n page 99 by using because f.
1 Tina was surprised/the yellw light in the sky ___________________________________________________2 The aliens landed n this planet/an accident ___________________________________________________3 The children ran away frm the frest/the aliens ___________________________________________________4 Their dad was nt sure abut the children’s stry/the writing n the piece f paper ___________________________________________________ ___________________________________________________
Tina was surprised because f the yellw light in the sky.
The aliens landed n this planet because f an accident.
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.