广州深圳新牛津版教材七年级下册Unit4知识点小结

1、学习必备欢迎下载unit 4 save the trees学问点小结1. discuss the importance of trees讨.论树木的重要性；1） discuss及物动词，意为“争论，谈论” ；we should discuss the problem face to fac我e. 们应当面对面地争论这个问题；i have something important to discuss with you我.有要事与你商谈；2） importance 不行数名词， 意为“重要性”，其前面加定冠词the；the importance of 意为“的重要性”；do you know th

2、e importance of salt. 你知道盐的重要性吗？2. if i plant this seed in the ground, will it become a pear tree, hi.假如我把这粒种子种在地里，它会长成一棵梨树吗，hi ？if 引导条件状语从句时，意为“假如” ；条件状语从句表示主句动作发生的条件，有从句的动作发生就会有主句的动作发生；复合句一般都要遵循主、从句时态呼应规律；1）主句（包括祈使句和情态动词can, may, must等的句子）用一般现在时，从句也用一般现在时；you must see a doctor if you are ill如.果你生病

3、了，你必需去看医生；2）假如主句是一般将来时，从句要用一般现在时表将来；即“主将从现”；we will go out if it is fine tomorrow. 假如明每天气好，我们就出去；助记： if 条件句不一般，几个要点记心间；条件句放在前，逗号要放句中间；条件句表事实，主句常用现在时；条件句表可能，主将从现要牢记；the children will climb the hill if it tomorrow.a. won t rainb. didn t rainc. isn t rainingd. doesn t rain解析：在含有 if 引导的条件状语从句的主从复合句中，主句是

4、一般将来时，从句用一般现在时表将来；句意：假如明天不下雨，孩子们将去爬山；3. they help fight against pollution.他们帮忙与污染作斗争；1） fight 不及物动词，意为“与作斗争” ；常与介词 against或 with 连用；they fought against the enemy fiercely他.们猛烈地仍击敌人；she was always fighting with her neighbours about the fence.她和他的邻居总是为了栅栏的事争执；拓展： fight 及物动词，意为“战役；反对” ，可直接跟宾语；they foug

5、ht their enemies bravely他.们英勇杀敌；2） against 介词，意为“反对” ；其反义词是 for，意为“支持，拥护” ；一言辩异： are you against or for the plan. 你是反对仍是支持这个方案？ 拓展： against 介词，仍可意为“违反，违反；紧靠；防范”；it s against your promise to go on smokin继g续.抽烟，这违反了你的诺言；we take our umbrella just against a rainy day.我们带上雨伞以防雨天；学习必备欢迎下载4. they provide u

6、s with wood, fruit, etc.它们为我们供应木材、果实等；provide 及物动词，意为“供应；供应；供应” ；provide sb. with sth.= provide sth. for sb.意为“为某人供应某物” ；sheep provide us with wool.= sheep provide wool for us绵.羊为我们供应羊毛；5. the lives of trees.树的生命；lives 是 life 的复数形式，意为“生命”in the earthquake, many people lost their lives在.地震中，很多人失去了生命；

7、6. they help us in many ways.它们在很多方面帮忙我们；in many ways 意为“在很多方面” ；way 作可数名词，可意为“方面；方式；道理”；do it in your own way. 按你自己的方法做吧；it s the best way of sytiundg/to study english. 这是学习英语的最好方法；the little girl asked me the way to the park. 小女孩问我去公园的路；7. they take in harmful gases from the air and produce oxygen

8、 for us to breathe.它们从空气中吸取有害的气体，产生供我们呼吸的氧气；1） take in 意为“吸取”；on weekends the smiths usually drive to the countryside and take in the fresh air there周. 末，史密斯一家常驱车到农村去呼吸那里的新奇空气；2） harmful 形容词，意为“有害的” ； be harmful to 意为“对有危害” ；it s harmful to your eyes to read in the b在us公.共汽车上看书对你的眼睛有害；smoking is har

9、mful to one s 吸he烟al有th.害健康；3） provide 及物动词，意为“产生；生产” ，接名词或代词作宾语；what does the farm produce.这个农场生产什么？the factory produces 1,000 cars a month.这家工厂每月生产1000 辆汽车；拓展： produce 不行数名词，意为“产品；农产品” ；he took the produce of his garden to the market every sunday. 他每周日把菜园的农产品送到市场上卖掉；8. in fact, we get a lot more f

10、rom trees.准确地说，我们从树木中得到更多；1） in fact 意为“（补充细节）准确地说； （强调）事实上，实际上” ；i used to live in france; in fact, not far from where you are going.我曾在法国住过；准确地说，离你要去的地方不远；in fact, i didn gto home last night. 事实上，我昨晚没有回家；依据中文提示完成句子，没空一词； （事实上）， he is afraid of making speech in public.解析：由汉语提示可知填入in fact，意为“事实上，实际上

11、” ；答案：in fact学习必备欢迎下载2 a lot more 意为“更多”，a lot 可放在形容词或副词的比较级之前，表示程度，意为“很， 特别”；he is feeling a lot better. 他感觉好多了；9. a lot of the furniture is made of wood许.be made of 意为“由制成” ；多家具是由木头制成的；my desk is made of mood. 我的课桌是由木头制成的；辨析： be made of与 be made frombe made of 从产品中能看到原材料；制作过程中发生了物理变化be make from 从

12、产品中看不出原材料；制作过程中发生了化学变化the house are made of wood.这些房子是由木头做成的；wine is make from grapes. 葡萄酒是由葡萄制成的；助记：物质不变用of ，物质变化 from ；do you believe that paper is made wood.yes, i do. and you can see that books are made paper.a. from; fromb. from; ofc. of; fromd. of; of解析： be made of 与 be made from 都意为“由制成” ； be

13、 made from 后的原材料不能从产品中看出， be made of 后的原材料能从产品中看出；答案：b10. i can t imagine a world wituhtotrees. 我不能想象没有树的世界；imagine 动词，意为“想象，想到” ；后可接名词、代词、动名词或宾语从句；i can t imagine what had happen我ed无.法想象出了什么事；can you imagine who is knockingat our door outside. 你能想到是谁在外面敲我们的门吗？the internet is so closely connected wi

14、th our daily life. can you a life without it.a. understandb. imaginec. considerd. expect解析： understand“懂得”，imagine“想像”；consider“考虑”；expect“希望”；由第一句“互联网与我们的日常生活如此亲密相关” 推知，其次句句意为“你能想象没有互联网的生活吗？” 答案： b11. but we cut down millions of trees every year但.1） cut down 意为“砍伐；砍倒” ；是我们每年砍伐数以百计的树木；don t cut down

15、 the tree that gives you shade遮. 阴之树不行砍；2） millions of 意为“大量的；数以百计的” ；当表示一个笼统的概念时，hundred，thousand， million ， billion 等词常用复数形式，且与介词of 连用修饰名词；millions of visitors came here last year. 去年大量的客人来这里；he has read hundreds of books.他已读过数百本书；did you know that the earth is home to animal.a. millionb. millions

16、c. million ofd. millions of学习必备欢迎下载解析：当表示不确定数目时，用millions of ，排除 b、c 两项；表示准确数目时， million 前面有数词修饰，用单数，排除a 项；答案： d12. however 然而however 副词，意为“然而；不过” ，表示转折；you may, however, set off a little earlier. 然而你们可以早一点动身；辨析： however 和 buthowever 副词；可位于句首、句中、句末；必需用逗号与句中分开；but 连词；位于句首或句中；后来连接一个句子时无需用逗号；this book

17、is cheap,however, it s very use这fu本l. 书廉价，然而，它很有用；he often eats only a little, but he doesn他经t fe常el吃h得un很gr少y. 却不感到饿；13. useto do sth. 意为“用来做” ，其中动词不定式to do sth表.he uses the bottle to keep water.他用瓶子来装水；you could use a big bag to carry the books.你可以用一个大袋子装书；示目的或用途；14. we are having fun at the beach

18、.我们正在海滩上玩的兴奋；1） have fun 意为“玩得兴奋， 玩得开心”，相当于 enjoy oneself或 have a good time； have fun中的 fun 是不行数名词，可用a lot of 修饰；we have fun in the park. 我们在公园里玩得高兴；you are sure to have fun at the party.在聚会上你肯定会玩得兴奋；2） at the beach意为“在海滩上”，不仅指在海滩上，也可指海滩有浅水的地方；the boat stopped at the beach.小船停在海滩上；15. on the beach意为

19、“在海滩上”，指的是海滩上无水的地方（陆地） ；i like lying on the beach to relax. 我喜爱躺在沙滩上放松；16. on the phone意为“在打电话，在电话中” ，与 by phone同义；介词 on 表示“通过某种方式”；we talk on the phone. 我们用电话交谈；let s talk about it on the phon我e.们在电话里谈论吧；17. she can skate at a very high speed because she practise a l她ot能.由于她常常训练；1) at a very high s

20、peed意为“以特别快的速度”以特别快的速度滑冰，the car is running at a very high speed汽.车正急速向前行驶；2) practise及物动词，意为“训练；练习” ；宾语可以是名词、代词或动名词；you must practise speaking english every day.你必需每天练习说英语；学习必备欢迎下载she practise playing the piano every morning.她每天早晨练习弹钢琴；拓展：practice 不行数名词，意为“练习”，指常常性或系统的重复练习； 在美式英语中， practice也可作动词，相当

21、于英式英语中的practise；playing the piano needs a lot of practice.弹奏钢琴需要多加练习；why don t you join an english club to practise speaking english.你为什么不参与英语俱乐部练习口语呢 .tim played the guitar very well in the school talent show.i think so. he practices it every day.a. playb. playingc. to playd. plays解析： practice 后跟名词

22、或动名词形式，不能跟动词不定式，因此选b；答案： b18. but the speaker did not stop speaking until twenty past twelve.但是发言者直到12 点 20才停止讲话；notuntil意为“直到才.”；句子（主句）的动词一般是非连续性动词，它所表示的动作直到 until 所表示的时间才发生；we won t see any flowers until may直.到五月我们才能看到花；you cannot leave until your work is finished. 在你的工作完成之前你不能离开；拓展：until 连词，意为“直到

23、时”；用于确定句， 句子（主句） 的动词一般是连续性动词；he waits until the children are asleep.他始终等到孩子们睡着；i shall stay here until twelve o clock.我将待在这里始终到十二点钟；where are you going for the coming winter camp.i won t decide on the place the end of this month.a. untilb. unlessc. thoughd. through解析： until “直到”；unless“除非”； though“尽

24、管”；through“通过”；由答语句意“直到这个月末，我才把地点定下来”可知until 符合题意；答案： a19. dig 及物动词，意为“挖” ，其后可接名词或代词作宾语；they are digging a tunnel through the hill.他们正在挖一条贯穿这座山的隧道；we must dig the vegetable garden我. 们必需把菜园挖一遍；20. another 形容词，意为“三者或三者以上的另一个，再一个”；he asked me another question他.又问了我一个问题；辨析： another, other, the other, ot

25、hers, the othersanother 形容词；代词，“三者或三者以上中的另一个”other 形容词“其他的，其余的” ，作代词时，常用复数形式；the other 指两者中的另一个，常与one 连用:onethe other意为“一个另一个”others 代词，意为“其他的人或物”the others 意为“其余的人或物，表示一个范畴内的其他全部”i don t like this oneh. osw me another, please. 我不喜爱这个，请给我看看另一个；学习必备欢迎下载i d like to travel to other countries我.想到别的国家旅行；

26、he has tow daughters. one is nurse; the other is a worker他.是工人；有两个女儿，一个护士，另一个some peopleenjoy exercise, but others don有些人喜t欢.运动，但有些人就不喜爱；two boys will go to the zoo, and the others will stay at home. 两个男孩将去动物园，其余的待在家里；we have five kinds of schoolbags. do you like this one.no. can you show me .a. ano

27、therb. each otherc. the otherd. others解析： another意为“三个或三个以上中的另一个” ；句意“我们有五种书包，你洗这个吗？” “不；你可以给我看看另一个吗？”答案：a21. itcovers five and a half million square kilometres of the amazon basin and spreads across nine countries.他掩盖了亚马逊流域550 百万平方千米的面积，横穿了9 个国家；cover 动词，意为“掩盖， 遮盖”；coverwith意为“用把盖上” ，be covered wit

28、h意为“被掩盖着” ；cover a glass of water with a piece of thick paper.用一张厚纸盖在一杯水上；the road is usually covered with snow in winter. 冬天公路常常被雪掩盖；拓展： cover 可数名词，意为“掩盖物，盖子，封面”in spring, people put covers over plants to keep them warm at night春.放置一些掩盖物来给它们取暖；the book needs a new cover.这本书需要一个新封面；22. this is calle

29、d“deforestation” .这叫做“森林砍伐” ；be called 意为“被称作，被叫做”the outgoing girl is called alice.那个开朗的女孩叫爱丽斯；天，人们晚上在植物上23. many living things lose their homes because of deforestation.很多生物由于森林的砍伐失去家园；because of意为“由于”；the football match was put off because of the rain.由于下雨，足球赛延期了；辨析： because of与 becausebecause of

30、 介词短语；其后接名词、代词、动名词等because 连词；后跟句子，是主句的直接缘由he lost his job because of his age.由于年龄关系他失去了工作；i didn tybitubecause it was too expensive.我没有买它是由于它太贵了；24. as a result, the number of kinds of animals, birds, insectsand trees in the world is decreasing. 结果，世界上动物、鸟类、昆虫和树的数目正在削减；学习必备欢迎下载1） as a result 意为“结果，

31、因此” ；he didn t practise, and as a resultohset. l他没有练习，因此输了；the traffic was very happy. as a result, we didn t交a通rriv十e分on拥ti挤m，e. 由于我们没能准时到达；2） the number of 意为“的数量”the number of the students is our class is 50我.辨析： the number of 和 a number of们班同学的人数是50；the number of 意为“的数量” 后街复数名词，但谓语动词要用单数形式； 常跟 l

32、arge,samll等词作表语；a number of 意为“大量；很多”相当于many；接复数名词作主语时，谓语动词用复数形式；number 前可加 small; large; huge等表示程度；the number of the students in our school is 2,000.我们学校的同学人数是2,000；a number of students are playing football许.多同学正在踢足球；how many students are there in your school. the students in our school over two th

33、ousand.a. the number of; isb. the number of; arec.a number of; isd. a number of; are解析： a number of“很多，大量”，作主语时，谓语动词用复数形式；the number of“的数量”，作主语时，谓语动词用单数形式；答句句意“我们学校同学的人数是两千多”；答案： a25. we must do our best to protect the amazon rainforest. 我们必需尽我们最大的努力来爱护亚马逊雨林；1） do one s best to do s意th.为“尽某人最大的努力做某

34、事” ，可换成 try one s best to do sth.we should do/try our best to study english.我们要尽全力学习英语；2） protect 动词，意为“爱护”；常与介词 from 连用，构成短语protect sb. from sth. 意为“爱护免受的损害” ；wearing dark glasses can protect your eyes from the sun戴.射；墨镜可以爱护眼睛不受阳光的照拓展： protectfrom中，动词 protect 所接的宾语是被爱护的对象；parents try to protect their children from danger as far as possible. 父母想尽量爱护自己的子女免遭危急；26. tea is the most popular drink in the world besides water. 茶是世界上除了水之外最受欢迎的饮料；besides介词，意为“除之外（仍有） ；five ot