《Teenagers should be allowed to choose their own clothes》PPT課件9
Review
Talk with your classmates about your school rules by using “students are not allowed to…”.
一般現在時的被動語態
在英語中，動詞有兩種語態，即主動語態和被動語態。被動語態的基本結構是“助動詞 be + 及物動詞的過去分詞”，其中助動詞be有人稱、數和時態的變化,其變化規則與be作為連系動 完全一樣。
1.一般現在時被動語態的各種句式結構
肯定式 主語+am/is/are+過去分詞（ + by…)
否定式 主語+am/is/are + not +過去分詞 (+by…)
疑問式 Am/Is/Are+主語+過去分詞(+ by …)?
特殊疑問詞+ am/is/are+主語+過去分詞（+ by ...)?
2.一般現在時被動語態的基本用法
表示經常性或習慣性發生的被動動作
I am often asked the question by my pupils.
表示近期正在發生的被動動作
These days people are moved by a teacher named Zhang Lili.
描述某種常態化的被動的客觀事實
The spaceship is mainly controlled by computer.
強調目前存在的針對行為主體人的被 限制性動作
You aren’t allowed to take photos.
3.主動語態變為被動語態的方法
第一步:將主動語態的賓語改為被動語態的主語；
第二步:將主動語態的謂語改為“be+及物動詞的過去分詞”結構；
第三步:將主動語態的主語改為介詞by的賓語，放在謂語之后(有時可省略)。
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Rewrite the sentences according to the example.
1. You must clean your bedroom every day.
Your bedroom must be cleaned every day .
2. Parents should encourage teenagers to do social work for their community.
Teenagers _____________________________ .
3. Can Lucy do her homework tomorrow instead?
Can__________________________________ ?
4. Do you think we must keep teenagers away from the Internet?
Do you think teenagers__________________________ ?
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Language points
1. Do you think teenagers should be encouraged to make their own decisions? 你認為應該鼓勵青少年自己做決定嗎？
make one’s own decision 意為“自己做決定”，相當于make a decision for oneself。
例：I just want to make my own decision.我只想能夠自己做決定。
2. Parents should give teenagers chances to make their own decisions. 父母應該給青少年自己做決定的機會。
chance (a suitable time or situation when you have the opportunity to do sth.) 可數名詞，意為“機會；機遇”，其后可接to do sth.或of sth.。若表示“做某事對某人來說是一次機會”，其后可接for sb. to do sth.。
例：I never miss a chance to play football.我從不錯過踢球的機會。
It’s a good chance for you to meet.這是一個你們見面的好機會。
3. This way, when they _______(start) working they can manage their own lives.
這樣，當他們開始工作時，他們能應付他們自己的生活。
manage 意為“完成(困難的事);應付(困難) 局面”， 其后可接名詞、代詞或動詞不定式。
例：I’m not sure how we will manage it.
我不確信我們將如何完成這件事。
You should manage to finish the work in time.
你應該設法及時完成工作。
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Homework
Master what you have learned in this lesson. Learn to make sentences with “情態動詞+be+及物動詞的過去分詞”.
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