《We're trying to save the earth!》PPT课件3
Fill in the blanks with the correct forms of the verbs in brackets.
Joe: _____ you ever _____ (take) part in an environmental project?
Ken: Yes, I have. I ______ (help) with a Clean-Up Day last year. It was________(consider) the biggest clean-up project this city____ever ________(have).
Joe: How many people ______ (take) part?
Ken: I _____ (think) more than 1,000 people _____(come) to help out.
Joe: That’s fantastic! I guess everyone in this city is _____ (try) to improve the environment.
Ken: Yes, we can't affort to _____ (wait) any longer to take action!
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现在进行时
（1）含义：①表示现在正在进行的动作。②表示现阶段一直进行的动作。
（2）基本结构：am/ is/are + 现在分词
（3）标志词：now, right now, Look, Listen at present, this week, these days
（4）现在分词的构成：
①一般情况下在动词词尾加-ing。如：go--going。
②以不发音的字母e结尾的动词，去掉e加-ing。如: have--having。
③以一个辅音字母结尾的重读闭音节，双写最后一个字母，再加-ing。如：stop--stopping。
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现在完成时
（1）含义：
①表示过去发生的动作，对现在造成的影响。
②表示过去发生的动作或存在的状态一直延续到现在，还可能继续下去。
（2）基本结构：have / has + 过去分词
（3）标志词：already, yet, ever, never, once, twice, recently, so far,
for+时间段, since+时间点/从句，
in the past + 时间名词，
in the last +时间名词。
（4）过去分词的构成：
①一般情况下在动词词尾加-ed。如：work--worked。
②以e结尾的动词后只加-d。如：close--closed。
③以辅音字母+y结尾的动词，应将y改为i再加ed。如：study--studied。
④以重读闭音节结尾的动词，要双写末尾的辅音字母再加-ed。如：stop--stopped。
⑤不规则动词的过去分词：AAA型；AAB型；ABA型；ABB型；ABC型。
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被动语态
初中阶段我们学习了8种被动结构，归纳如下：
（1）一般现在时的被动式：am / is / are + 过去分词
（2）现在完成时的被动式：have / has + been + 过去分词
（3）现在进行时的被动式：am/ is/ are + being + 过去分词
（4）一般过去时的被动式：was / were + 过去分词
（5）过去进行时的被动式：was / were + being + 过去分词
（6）过去完成时的被动式：had + been + 过去分词
（7）一般将来时的被动式：will / be going to be+ 过去分词
（8）含有情态动词的被动式：情态动词+be +动词的过去分词。
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情态动词练习
1.-- ____ you pass me a pen? I'd like to write down the phone number.
-- Sure. Here it is.
A.Can B.Need C.Might D.Must
2. -- May I go to the cinema, Mum?
-- Certainly, but you ___ be back by 11 o'clock.
A.can B.may C.must D. need
3. you ___ worry about me. It's nothing serious.
A.can't B.mustn't C. needn't D. won't
4. -- Excause me. Is this the right way to the Summer Palace?
-- Sorry, I'm not sure. but it ____ be.
A.might B.mustn't
C.can't D.must
5. The man in the office ____ be Mr.Black, because he went home just now.
A.musn't B.may not
C.can't D.needn't
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I. 用所给词的适当形式填空。
1. The old man used _____ (be) a teacher.
2. We should _____ (clean) the room every day.
3. Look! Tom _________ (sleep) in his room.
4. Lots of trees __________ (plant) on the hill every year.
5. He _________ (live) here for 20 years.
用括号里所给动词的正确形式填空
1. The girl ___________(dance) in the classroom.
2. It's 5 o'clock now. Mike _________ (have)dinner.
3. --_____ you ever ____ (be) to the US?
-- Yes, twice.
4. -- May I speak to John?
-- Sorry, he __________(go) to New York. he will be back in two days.
5. --Did you go to Jack's birthday?
-- No,I ______________(not invite).
... ... ...
Fill in the blanks with the appropriate modal verbs from the box.
can could would have to should must may/might
People _____ think that big things _____ be done. However, many forget that saving the earth begins with small things. For example, you _____ save electricity by turning off the lights when you leave a room. You _____ also use paper or reusable bags instead of plastic bags.
Homework
write an article to show in what way we students can protect the environment.
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