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1、第四課時(shí)Section B (1a1e),Unit 13Were trying to save the earth!,Recycling paper is really easy.循環(huán)利用紙真的很容易。 I agree.But its hard to stop riding in cars.我同意你的觀點(diǎn)，但是停止駕車很難。 recycle動(dòng)詞，意為“再循環(huán)，回收利用”。前綴re表示重復(fù)，意為“又，再”。 eg：repeat重復(fù) reuse重新使用 recycling paper是動(dòng)詞ing形式短語作主語，其后的謂語用單數(shù)形式。該句可以改寫為“Its really easy to recycl

2、e paper.”。,句中it為形式主語，to stop riding in cars是動(dòng)詞不定式短語作真正的主語。 stop doing sth.意為“停止做某事”；而stop to do sth.意為“停下正在做的事去做另外一件事”。 eg：The baby stopped crying as soon as he saw his mom.這個(gè)嬰兒一看見他的媽媽就停止了哭泣。 After twohour work，we stopped to relax.兩個(gè)小時(shí)的工作以后，我們停下來去放松了一下。 【拓展】stop sb./sth.from doing sth.阻止某人/某物做某事,【辨析

3、】while，when與as 三者均可表示“當(dāng)時(shí)候”。若主句表示的是短暫的動(dòng)作，而從句表示的是一段時(shí)間，三者可通用。 eg：I met Tom as/when/while I was walking along the street.當(dāng)我沿街散步時(shí)碰見了湯姆。 when和while意為“當(dāng)?shù)臅r(shí)候”，when可以表示時(shí)間點(diǎn)，也可以表示時(shí)間段，謂語動(dòng)詞可以是終止性動(dòng)詞也可以是延續(xù)性動(dòng)詞。而while只表示“在某一段時(shí)間里”，因此它引導(dǎo)的從句中的動(dòng)詞必須是延續(xù)性的。as則含有主從句動(dòng)作同時(shí)發(fā)生之意。,一、根據(jù)句意，用括號(hào)中所給單詞的適當(dāng)形式填空。 1It is very important

4、 (recycle) paper and books. 2Since then，the government (pass) laws to protect them. 3 (climb) mountains is really fun. 4You should turn off the shower while you are (wash) your hair. 5The driver stopped (drive) when he saw some children crossing the street.,to recycle,has passed,Cli

5、mbing,washing,driving,二、單項(xiàng)選擇。 ( )6. I got home，my sister was doing her homework.(2016，北京) AWhenBBecauseCIf DThough ( )7.The boy is sleeping.Please the radio.(2015，益陽) Aturn up Bturn off Cturn on ( )8.To protect the environment，people are supposed to some waste things. Areceive Brecycle Crefle

6、ct Dreview,A,B,B,( )9.Bob took a photo of his girlfriend while she at the party.(2015，資陽) Adances Bwas dancing Chas danced Dis dancing ( )10.The traffic is becoming worse and worse in big cities because of private cars. .People should use public transportation more often. AI agree BId love to

7、 CI hope not DIm afraid not,B,A,三、從方框中選擇合適的選項(xiàng)補(bǔ)全對(duì)話。(其中有兩項(xiàng)多余) Bob：Good morning，Kim. Kim：Good morning. Bob：11. It can save a lot of time. Kim：Well，I prefer walking to driving a car. Bob：Mm，its good for health and the environment. Kim：Yes.The environment is very important for us.12. Bob：Yeah，right.Wha

8、t else can we do? Kim：For example，wed better not buy clothes made of animal fur. Bob：I agree with you.13. Anything else?,B,A,D,Kim：Dont use plastic bags. Bob：14. Kim：Yes，they are really useful for us.But they pollute our environment. Bob：15. Kim：We can use cloth bags instead of plastic ones. Bob：T

9、hats a good idea.Oh，its late.I must go now.See you! Kim：See you！Bye! AEveryone should do something for it. BWhy dont you drive to work? CIts useless for protecting plants. DIts a good way to protect animals. EBut dont you think they are really convenient in our daily lives? FWhy do you go to work in a car? GHow can we carry things after shopping，then?,E,G,