《We're trying to save the earth!》PPT課件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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現在進行時
（1）含義：①表示現在正在進行的動作。②表示現階段一直進行的動作。
（2）基本結構：am/ is/are + 現在分詞
（3）標志詞：now, right now, Look, Listen at present, this week, these days
（4）現在分詞的構成：
①一般情況下在動詞詞尾加-ing。如：go--going。
②以不發音的字母e結尾的動詞，去掉e加-ing。如: have--having。
③以一個輔音字母結尾的重讀閉音節，雙寫最后一個字母，再加-ing。如：stop--stopping。
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現在完成時
（1）含義：
①表示過去發生的動作，對現在造成的影響。
②表示過去發生的動作或存在的狀態一直延續到現在，還可能繼續下去。
（2）基本結構：have / has + 過去分詞
（3）標志詞：already, yet, ever, never, once, twice, recently, so far,
for+時間段, since+時間點/從句，
in the past + 時間名詞，
in the last +時間名詞。
（4）過去分詞的構成：
①一般情況下在動詞詞尾加-ed。如：work--worked。
②以e結尾的動詞后只加-d。如：close--closed。
③以輔音字母+y結尾的動詞，應將y改為i再加ed。如：study--studied。
④以重讀閉音節結尾的動詞，要雙寫末尾的輔音字母再加-ed。如：stop--stopped。
⑤不規則動詞的過去分詞：AAA型；AAB型；ABA型；ABB型；ABC型。
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被動語態
初中階段我們學習了8種被動結構，歸納如下：
（1）一般現在時的被動式：am / is / are + 過去分詞
（2）現在完成時的被動式：have / has + been + 過去分詞
（3）現在進行時的被動式：am/ is/ are + being + 過去分詞
（4）一般過去時的被動式：was / were + 過去分詞
（5）過去進行時的被動式：was / were + being + 過去分詞
（6）過去完成時的被動式：had + been + 過去分詞
（7）一般將來時的被動式：will / be going to be+ 過去分詞
（8）含有情態動詞的被動式：情態動詞+be +動詞的過去分詞。
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情態動詞練習
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. 用所給詞的適當形式填空。
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.
用括號里所給動詞的正確形式填空
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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