《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!

... ... ...

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。

... ... ...

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。 

... ... ...

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。

... ... ...

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

... ... ...

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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