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(共12張PPT)
Unit 6 Nurturing nature
Using language
Which of these statements is true about sentence (a)
Wild animals started using these passages in the past.
Wild animals used these passages only once.
Wild animals still use these passages now.
Look at the sentences from the reading passage and answer the questions.
Look at the sentences from the reading passage and answer the questions.
They are different in form and meaning.
sentence (a): the action is continuous from the past;
sentence (b): the action happened once in the past.
2. What is the difference between the expressions in bold in sentences (a) and (b)
肯定：have / has been doing
否定：haven’t/hasn’t been doing
現在完成進行時表示動作從過去某一時間開始一直持續到現在，并且還可能繼續進行。
1. 現在完成進行時的形式(Form)
2. 現在完成進行時的概念(Meaning)
1）在不用時間狀語的情況下，have been doing的動作不一定已經完成(即強調延續)， 而have done一般表示動作已經完成（即強調結果）。
例句分析：
He has been writing a novel, which will be finished next month.
He has written a novel, which is being prepared to come out now.
3. 現在完成進行時與現在完成時的區別
2）have been doing往往表示動作在重復，而have done一般不表示動作的重復。
例句分析：
I have been visiting my hometown recently, and it impresses
me differently each time.
最近我總回老家，每次感覺都不一樣。
I have visited my hometown recently, whose changes have
left a deep impression on me.
最近我回了趟老家，那里巨大的變化讓我驚訝。
3. 現在完成進行時與現在完成時的區別
3）have been doing與所有進行時態一樣帶有感彩，可使表達顯得生動；而現在完成時往往只表明一個事實、一種影響或結果，不帶感彩。
例如：
Recently he has always been helping me.
最近他總幫我（感激 ）。
Recently he has helped me a lot.
最近他幫了我很多（客觀陳述）。
3. 現在完成進行時與現在完成時的區別
1.Mary really hard on his book and thinks he’ll have finished it by Friday.
worked B. has been working
C. had worked D. has worked
2.—Where is Peter I can't find him anywhere.
—He went to the library after breakfast and _____ his essay there ever since.
wrote B. had written
C. has been writing D. is writing
Practice: Activity 2
1. have been hearing
2. has been making
3. is moving
4. have been flying
5. have been given
6. have been using
Practice: Activity 3
Look at the charts and make sentences using the present perfect continuous tense.
1. The number of trees has been increasing in the last 20 years.
2. Desert areas have been reducing in the last 20 years.
3. Butterfly population has been increasing / has been becoming larger and larger in the last 20 years.
Practice

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