(
课件网) Unit 8 We're trying to save the earth! SectionA GF-4c Revision 不同种类的污染 2. 河底 3. 把垃圾扔到河里 4. 在……中起作用 different kinds of pollution the bottom of the river throw rubbish into the river play a part in I. Check if you know these phrases. 5. 在中国南部 6. 对……有害 7. 在……顶部 8. 海洋生态系统 in southern China be harmful to at the top of… the ocean’s ecosystem 1.听说 hear of 2.切除 cut off 3.不再 no more = not…any more 4.不但...而且... not only ...but also 5.在过去的20--30年里 in the last 20 to30 years 6.对...有害 be harmful to 7.在...的顶部 at the top of 8.比如 such as 9.对...有益 be good for 10.到目前为止 so far 11.事实上 in fact 12.处在危险中 be in danger Grammar Focus We’re trying to save the earth. Present progressive The river used to be so clean. used to The air is badly polluted. Passive voice No scientific studies have shown that shark fins are good for health. Present perfect We should help save the sharks. Modal verbs 现在进行时: Present progressive 结构: be (am/is/are) + v.-ing 标志词:Look, Listen, now, right now… e.g. Look! The boy is crying. 定义:表示说话时(瞬间)正在进行的动作, 也表示目前或现阶段正在进行的动作。或说话者的强烈情感。 一、现在进行时: ①表示现在(说话的瞬间)正在进行的动作、发生的事情,常与now/right now/at this moment/ at present等时间状语连用,或用在look/listen等引出的句子里。 e.g. What are you doing at home now 你现在在家干什么? Look! A monkey is climbing the tree. 看!一只猴子在爬树。 ②表示当前一段时间内的活动或现阶段正在进行的动作(说话时动作不一定正在进行),常与at present/these days/this week(month,term)等时间状语连用。 e.g. She is working for a company at present. 她目前正在一家公司上班。 I'm looking forward to hearing from you soon. 我期盼很快收到你的来信。 ③表示反复出现的习惯性动作;表示说话人现在对主语行为的赞美、遗憾、讨厌、不满、同情等情感或对某一心理的生动描述,常与always/usually/all the time 等副词连用。 e.g. He is always doing things carelessly.他做事总是马马虎虎的。 Conditions are changing all the time. 情况始终都在变化。 ④表示根据计划或安排,在近期内即将进行的动作或马上就要发生的事,常与表示将来的时间状语连用,常用的有come/go/leave/start/arrive/return/stay等表移动、方向的动词。 e.g. They are leaving for Paris this afternoon.他们今天下午动身去巴黎。 Mr. Green is flying to Canada tomorrow. 格林先生明天就要飞往加拿大。 现在分词的构成: a. 一般情况下在动词词尾加-ing; b. 以不发音的e结尾的动词,去掉e加-ing; c. 以重读闭音节结尾且末尾只有一个辅音字母的, 双写最后一个字母,再加-ing; d. 以ie结尾的变ie为y,再加-ing. 练习:写出下列动词的现在分词 see _____ say _____ stop _____ have _____ listen _____ use _____ forget _____ burn _____ lie_____ seeing saying stopping having listening using forgetting burning lying 用括号内所给动词的适当形式填空。 Listen! The phone _____(ring). Please go to answer it. — Alan, it’s late. Why not go to bed — Jenny hasn’t come back yet. I _____(wait) for her. 3. — What’s your father do ... ...