【画龙点睛】外研版高中英语必修1教案：Unit5SectionⅣ.doc

section grammar & writing形容词/副词的比较级观察下列从introduction和grammar 2中选取的句子，体会形容词比较级的用法。1the earth is twice as large as the moon.2the earth is fortynine times larger than the moon.3its getting brighter and brighter!4the closer you are，the more youll see.5the more books i read，the more information i learn.一、形容词或副词比较级的基本用法1同级比较：表示两者程度相同。(1).as形容词/副词as.“和一样”(2).not as/so形容词/副词as.“和不一样；不如”(3)as many/much名词as“和一样多”as形容词a/an单数名词as“和一样”tom runs as fast as mike.汤姆和迈克跑得一样快。this room is not as/so big as that one.这个房间不如那个大。i have as many books as tom.我有跟汤姆一样多的书。she is as good an actress as she is a singer.她当演员和当歌手都一样出色。2比较级：用于两者间的比较，表示“比更”。句型为：形容词/副词比较级than.she is younger than my sister.她比我妹妹年轻。she speaks louder than her mother.她比她妈妈说话声音大。(1)使用比较级时比较的对象应该相同。为了简洁起见，可用that代替前面出现的不可数名词或可数名词单数，those代替可数名词复数。the weather here is warmer than shanghai.()the weather here is warmer than that of shanghai.()这儿的天气比上海的天气暖和。(2)比较双方如果一方在程度或数量上超过另一方时，可在比较级前加上副词修饰语。常见的有：much，a little，a bit，a lot，far，by far，even，still，rather，any(疑问句、否定句或条件状语从句)，a great deal等。he is much taller than his younger brother.他比他弟弟高多了。are you feeling any better today?你今天感觉好些了吗？this movie is far more interesting than i expected.这部电影比我原想的有意思得多。二、形容词或副词比较级的特殊结构1the比较级(主语谓语)，the比较级(主语谓语)表示“越，越”the more you study，the more you know.学得越多，懂得越多。the more careful you are，the fewer mistakes youll make in the experiment.你越小心，你做实验犯的错误就越少。2比较级and比较级表示“越来越”it becomes warmer and warmer when spring comes.春天来了，天气越来越暖和了。my hometown is getting more and more beautiful.我的家乡变得越来越美丽。3the形容词/副词比较级of. 表示 “两者之中比较的一个”this is the bigger of the two rooms.这是两个房间中较大的一个。jack is the taller of the two boys.杰克是两个男孩中个子较高的一个。4“否定词比较级”表示最高级含义i cant agree with you more.我再同意你不过了。how beautifully she sings！ive never heard a better voice.她唱得多好啊！这是我听到的最好的嗓音。三、倍数的表达法1倍数as形容词或副词的原级as.the concert hall is four times as large as that one.这个音乐厅是那个的四倍大。2倍数形容词或副词的比较级than.this road is twice longer than that one.这条路比那条路长一倍。3倍数the性质名词(size，height，depth，length，width)ofour school is three times the size of yours.我们学校的规模是你们学校的三倍。.单句语法填空1as summer is coming，the day is becoming longer and longer(long)2the warmer(warm)the weather is，the better(good)the crops will grow.3the patient has responded to the treatment rather better(good)than expected.4your story is much longer(long)than mine，but it isnt so interesting as mine.5the hotel was much surprising cheap.i expected it to be more expensive(expensive).单句改错1ive worked with him for some time and have found he is more excellent teacher than mike. 2im not satisfied with her answer at all.it couldnt have been bad. 3i like rose and mary，but i think rose is nicer of the two. 4there are so fewer tailors and dressmakers in the us than in the european countries. 5after the new reform，the output of the paper mill is now three times as higher as it was in 2015. 【导学号：70452056】【答案】1.more前加a2.badworse3nicer前加the4.sofar/much5higherhigh如何写实验报告科学实验报告属于说明文。说明文是解说事物、阐明事理、给人以知、教人以用的文章。科学实验报告文体严谨，以传授知识为主，要求内容真实、措辞准确。时态常用一般现在时，多用祈使句和被动语态。正文可运用排列式：首先说明实验目的；接着交代实验用品实验仪器的具体名称；重点阐述实验步骤操作的先后顺序；最后总结实验结论。1常用词汇(1)描写实验目的：carry out an experiment to find out.the aim of the experiment is to find.with the purpose of discovering.do research on(2)描写实验用品：to carry out/make/do/perform the experiment，you need.the following things are needed.the following apparatus is used.(3)描写实验方法或过程：make good preparations for.it is important that.do the experiment as follows.firstly，secondly，thirdly，finally；first，then，next，after that，two hours later；after several daysfind a better way of doing.make a good study of.(4)描写实验结论：from this experiment we can conclude.draw/come to the conclusion that.we can learn from the experiment that.we can find out that.you can see/discover.in conclusion.(5)描写原因和结果：the reason is that.this is because.result from/in.lead to/cause.2常用句型here is a.这是一个.and then.然后after a while，we can.一会儿，我们就能3实验报告格式模板here is a report on.experiment，which shows us how we can produce.aim：to produce.apparatus：.method：1 2 3 result：if., it., which shows.conclusion：.化学课上学习了关于溶解的知识后，请你根据下表做一个化学实验，比较橘子汁和食用油在水中的溶解情况，然后用英语写一份实验报告，给出结论。词数：100左右。实验目的观察橘子汁和食用油这两种物质是否溶解于水。实验器材试管；小勺(spoon)实验方法(1)将水分别注入两个试管中，并确保水位相等。(2)把两种物质分别放在装有水的两个试管里。(3)待5分钟后观察反应。实验结果橘子汁溶解了，食用油没有任何反应。体裁说明文话题实验报告时态一般现在时人称第三人称.词汇1实验的目的the aim/the purpose of the experiment2查明find out3把倒入o.4相等的equal5同时at the same time6五分钟后five minutes later.句式1确保水位相等。make sure the two tubes have water of the same level.(用高级词汇equal改写句子)make sure the water level is equal in either tube.2五分钟后，橘子汁已经溶解了，但食用油仍保留在表面上。after five minutes，the orange juice has dissolved，but the oil remains on the surface.(用高级词汇later，however改写句子)five minutes later，the orange juice has dissolved，however，the oil remains on the surface. 【导学号：70452057】【参考范文】aim：to find out whether oil and orange juice dissolve in water.apparatus：test tubes；spoonsmethod：pour water into two test tubes.make sure the water level is equal in either tube.put a spoonful of orange juice into one tube，and a spoonful of oil into the o