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1、Unit 4Topic1 一.重点词语1. sharewith 与共享2. play with 玩弄，玩耍3. in danger 在危险之中4. feed on 以为食5. think about 考虑，思考6. enjoy nature 享受自然7. at night 晚上8. in the daytime 白天9. summer vacation 暑假10. thousands of 成千上万11. in fact 事实上12. find out 查明，发现13. in nature 在自然界二.重点句型.lants are more beautiful than animals.植物比
2、动物更漂亮。.The plants stay green longer there.那儿的植物能更长时间保持绿色。.The rainforests are very important to us.（热带）雨林对我们很重要。.Water is necessary for all plants.It is the most important thing to all living things,we must save every drop of water.水对所有植物是必需的。它对所有生物都重要，我们必须节约每一滴水。.Isnt it interesting？是不是很有趣呀？.It is
3、one of the most dangerous fish in the world.它是世界上最危险的鱼之一。.It is so strange！太奇怪了！三.语法学习（一.）形容词的比较级和最高级的构成. 规则变化：（1.）一般在词尾加er或est.如：freshfresherfreshest.（2.）以字母e结尾的形容词，加r或st,如：latelaterlatest.（3.）以重读闭音节结尾的词，词尾只有一个辅音字母时，应双写这一辅音字母，再加er或est.如：bigbiggerbiggest.（4.）以辅音字母y结尾的双音节词，先改y为i，再加er 或est.如：happyhapp
4、ierhappiest.（5.）部分双音节词和多音节词前面加more或most构成比较级或最高级。如：carefulmore carefulmost careful,beautifulmore beautifulmost beautiful.不规则变化：good/wellbetterbest,littlelessleast,many/muchmoremost,bad/illworseworst,farfarther/furtherfarthest/furthest.（二.）形容词的比较级和最高级的用法. 比较级或，经常与than搭配，或给出比较的二个内容。可用much和a little修饰.
5、三者或三者以上比较用最高级，一般给出比较范围如：of（in）。(1)例句：Im happier than you.我比你更快乐。Plants are much more beautiful than animals.植物比动物漂亮的多。()例句：The boy is the tallest in my class.这个男孩是我们班最高的。Lesson Two is the most important of all.第二课是所有中最重要的。四.交际用语：学习如何用英语描述和谈论我们生存的自然环境Do you like plants or animals?What are you thinkin
6、g about? Why do you think so?What kind of wild animal is the most dangerous,the tiger,the snake or the bear?Why must we save every drop of water?Topic 2 一. 重点词语1.take the place of 代替，取代2.instead of 代替，而不是3.mistakefor把错当4.seem to do 好象，似乎5.call for 要求6.wake sb. up 将某人叫醒7.see sb.doing sth. 看见某人正在做某事8.
7、use sth. for sth./doing sth. 利用某物做某事9.spendon 在上花费时间或金钱10.be sure of 确信11.these days 现在，目前12.in alphabetical order 按字母表顺序排列13.look up 查阅14.pay attention to 注意，专心15.begin with 以开始16.and son on 等等17.switch on 开（电灯，机器等）18.ask （sb.）for sth. 向要二重点句型1. Im sure robots can do some work better than humans. 我
8、确信机器人比人能更好地做某些工作。2. I saw a UFO while I was walking down the street yesterday. 昨天我沿着街道走时，看见了一个不明飞行物。3. It looked like a plate. 它看上去像一个盘子。4. Until now,even the scientists are not sure whether there are UFO. 直到现在，甚至科学家也不确信是否有不明飞行物。5. We can shop without going out of our houses. 我们不出家门就能购物。6. We can us
9、e the Internet for finding a job. 我们可以用网络来找工作。7. We shouldnt spend too much time on it.但是我们不应该在因特网上面花费太多的时间。8. When you look up a word in the dictionary,pay attention to the first letter of the word. 当你在字典里查一个单词的时候，注意这个单词的第一个字母。三.语法学习（一.）现在进行时与过去进行时的区别：.现在进行时表示现在正在发生或正在做的事情，基本结构be现在分词。如：肯定句：The robo
10、ts are making a car now. 这些机器人正在生产小汽车。否定句：We are not studying on the Internet. 我们没有在互联网上学习。疑问句：Is the teacher looking up the word in the dictionary？这个老师正在词典中查这个词吗？特殊疑问句：ho am I talking to？我在和谁谈话？.过去进行时表示过去某一时间，正在发生或正在做的事情。基本结构was（were）现在分词。肯定句：hen he came in,I was writing a letter.当他进来时，我在写一封信。否定句：T
11、hey werent watching TV while she was reading.她读书时，他们没在看电视。疑问句：Was the UFO flying to us at 8 last night ?昨晚点UFO向我们飞来了吗？特殊疑问句：What were you drinking while we were sleeping?我们睡觉时，你们在喝什么？进行时态往往用在时间状语从句中，常与when,while等连词搭配。（二.）be sure结构表示肯定和不肯定。be sure一般用来表示肯定，be not sure（whether/if）表示不肯定。be sure后面可以跟不定式和
12、宾语从句。跟不定式一般译为“一定”，跟宾语从句，译为“确信”。如：We are sure to repair the TV well. 我们一定修好这台电视机。Im sure you can finish your work. 我确信你能完成你的工作。Are you sure whether（if）he switched the computer on? 你确信他打开还是没有打开电脑？四.交际用语：学习用英语谈论现代科技。 Could you tell me something about robots? Can robots take the place of humans? Are you
13、 sure there are UFOs? Yes,Im sure. No,Im sure whether/if there are UFOs. What do you often do on the Internet?Topic 3重点词语1. more than 超过2.pull down 推倒，拆毁3.heavy traffic 交通繁忙4.wear out 磨损，用坏 5.used to do sth. 过去常常做某事6.do ones best 尽（某人）最大努力7.live models 真人模型8.the ancient world 古代9.be made up of 由组成10
14、.jointogether 把连在一起11.regardas 把看作12.be worn out 被损坏一. 重点句型1.Lots of them were pulled down in the 1960s. 他们当中许多在二十世纪六十年代被拆毁。2.People thought them useless. 人们认为它们没有用。3.Its really too bad. 这太遗憾了。4.We are doing our best to protect and rebuild the old city walls. 我们正在尽全力保护并重建老城墙。5.It is one of the“seven
15、 wonders”of the ancient world still standing. 它是现存的古代“七大奇迹”之一。6.It took 100,000 people over 20 years to build it. 修建它花了10万人二十多年的时间。7.Since then,people regarded the Great Wall as a symbol of the Chinese nation. 从那以后，人们就把长城看作是中华民族的象征。8.Every year many people find great pleasure visiting the wall.每年有许多人参观长城，从中得到极大乐趣。二. 语法学习反意疑问句：由陈述句（或祈使句、感叹句）加一个简短问句构成的疑问句叫反意疑问句。实质是前面陈述句的反问句。 一般对应规律：前肯后否；前否后肯。即陈述部分为肯
