第七单元。
一． 重点词组。
1. 某种。
2. 使…….进入。
3. 使……置于…..外；使…..与…..分开。
4. 以….的形式。
5. 保留。
6. 引起；造成。
7. 把…..扔掉。
8. 大量的。
9. 为了做某事。
10. -的答案。
11. 放弃；认输。
12. 回到…..上。
13. 回到/返回到….上。
14. 付出…….罚款。
15. 坐牢。
16. 使某人活跃起来。
17. 知道---熟悉。
18. 写作。
19. 通知。
20. 熄灭；扑灭。
21. 度假。
二． 重点句型。
1. we must do something to s**e earth.
析：do something意为“采取措施；想办法”。
2. it lets sunlight in and keep much of warmth from getting out.
析：let….in意为“让….进来”。
keep……from doing意为“阻止…….做”。
3. we must close the factories producting useless products.
析；producting useless products意为“生产没有用的产品”，是现在分词短语做定语。现在分词短语作定语要后置。
4. we must recycle more, give up all cars, and improve public transport.
析：give up意为“放弃”，可接名词，也可接动名词、不定式。
如：the doctor told him to give up smoking.
5. and finally, you see someone littering in the countryside.
析：see sb doing意为“看见某人在做某事”。
6. i think that’s too much!
析：that’s too much意为“太过分了”。
7. doctors believe living in this smog is as dangerous as smoking 600 cigarettes a day.
析：as dangerous as意为“与…….一样危险”，相比较的两部分都是动名词短语。
8. only a lot of rain can put them out.
析：put out 意为“扑灭”。out是副词，当宾语是人称代词时，要把它插在put和out之间。
三． 短语辨析。
1. keep ….from doing, stop….from doing
析：这两个短语都是“阻止……做…..可互换。
不过，stop….from doing中的from可以省略；但keep……from doing中的from则不可省略。keep……from doing中的from如果省略了，意义就相反了。
如：we should keep/stop people from cutting down too many trees.
2. in order to; in order that
析：in order to意为“为了”，后接不定式。
如：he studied hard in order to pass the exam.
in order that意为“为了”，后接目的状语从句。
如：he studied hard in order that he could catch up with others.
练一练。1. do you know the answerthe problem.
2. they aren’t __but they are happy and
3. we must close the factories___useless products.
produce
4. don’t___hope, try again and you will succeed some day.
up in out to
5. we need___better engines.
invent discover
6. today we are talking __pollution___
7. when the road is __you can cross it.
8. this __is easy. i can answer it
9. a house was on fire last night. the firemen___with water.
out it them out out them out it
10. the polluted air is __people’s health.
to to for d. good for
语法模块讲解。
1. why和because
why用来提问原因。如 why are you late again?
回答由why提出的问题要用because。
如：--why did you walk to school today?
---because my bike is broken.
2. 形容词的同级比较。
表示两者在某方面程度相同，要用“as+形容词/副词原级+as”结构。
如：mike is as tall as tom.
表示两者在某方面程度不同的比较用“not so/as+形容词/副词+原级+as”结构。如：
my handwriting is not as good as his.
3. 用like, the same as, different from表示比较。
like表示相像时，是介词，它引导的介词短语可做表语和定语。
he wants to be a teacher like his father.
the same as表示“同….一样”。same意为“相同的”.
在as….as句型中，当形容词是same时，要把前面的as改为the，就形成了“the same as”。
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