too...to...-与-enough...to...-与-so...that...的区别.doc
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1、too.to. 与 enough.to. 与 so.that.的区别 too+adj./adv. to+v.太.而不能做某事 例:He is too young to go to school. 他年纪太小还不能上学。 2.adj./adv.+enough to +v.足够.而能做某事 例:He is old enough to go to school. 他足够大了能上学了/他已到了上学的年龄了。 3.so +adj./adv.+that从句 如此.以致 例:He is so old that he can go to school. 通常来说,这三种句型可用于同义句转换,具体如下: too
2、.to. =not 反义词 enough to =so.that 否定句 例:He is too young to go to school. = He is not old enough to go to school. = He is so young that he cant go to school.too to . ; not enough toStep 1 看图说话 利用课本P36页的图画和提示词练说 tooto do 和not enough to do 句子。如:1. The snake / dangerous/ hold . / The boy not braveThe sna
3、ke is too dangerous to hold. The boy is not brave enough to hold it . 板书 tooto do 和not enough to do并让学生明确这两个短语的中文意思是 “太 而不能”。提醒学生观察这两个句子结构中的形容词用什么形式,to do中的do 可否变换形式。在准确理解的基础上继续看图说话。2. The girl / short / get on the elephant. / she / not / tall .3. The elephant / heavy / carry. / The boy / not strong
4、.4. The elephant / fat / go through the gate. / The gate / not wide.5. The monkey / far away / get the bananas. / The bananas / not near.6. The cat/ slow/ catch the bird./ It / cannot run/ fast .Step 2 抛砖引玉 板书The snake is too dangerous to hold. The boy is not brave enough to hold it . (改为同义句)The sna
5、ke is so dangerous that the boy _ hold it.学生在理解的基础上探求答案,在探求答案的过程中获得新知。板书 so that + 含有cant / couldnt do的否定句等同于tooto do; not enough to do 同步操练:1. The girl is too short to get on the elephant. (改为同义句) The girl _ to get on the elephant. The girl _that she _ get on the elephant. The elephant is so tall_
6、that the girl cant get on it . The elephant _ enough _ the girl _ get on. The elephant _tall _ the girl _ get on.完成句子后求异:与原句比较后发现:由too to do 结构转换为not enough to do 结构时,要找到句中形容词的反义词。与比较后发现:so that + 含有cant / couldnt do的否定句结构的句子,若主从句的主语不一致时,改写为too to do 或not enough to do 结构时, 要在不定式to do前添for sb ,若主从句的主
7、语一致,则不须添for sb。如: He is so young that he cant go to school. (改为同义句)He too young to go to school .He not old enough to go to school.观察 、 两句可得:在too to do 或not enough to do 的句子中,若to do 的宾语与句子的主语相一致时,须省略it。 发散思维:若把句子改为过去时,应该怎么办?1. The girl was too short to get on the elephant. (改为同义句)The elephant was so
8、 tall_ that the girl couldnt get on it .2. He ran very fast. He couldnt stop. He ran too fast to stop. He ran so fast that he couldnt stop. (方法是句型转换时要注意时态一致。)Step 3 链接中考 The panda is so fat that it cant go through the hole.(改写为同一意思的句子)The hole _ such a fat panda to go through.The ice on the lake was
9、 so thin that people couldnt skate on it. (改写为同一意思的句子)The ice on the lake was not _ enough _ people _.Mr. King is very busy at work. He cant take a holiday.(改为同义句)Mr. King is _ take a holiday.My grandfather is too old to travel around. (改为同义句)My grandfather is _ old _ he _ travel around any _.Step 4
10、 巩固练习My brother was so clever that he could work out the problem. (改为同义句)My brother _ work out the problem.The box isnt light enough for him to carry. (改为同义句)The box _ for him _ carry.He is very short . He cant reach the book on the shelf.(合并为一句)He is _ reach the book on the shelf.The water was so d
11、irty. We cant drink it. (改为同义句)The water was too _ .The water in this river is very dirty. Fishes cant live in it.The water in this river is _ that fishes _ in it.My brother got up late yesterday. He was late for school.My brother got up _ thatPractice One :1. a. The box is so heavy that I cant carr
12、y it. b. The box is _ heavy_ _ _ carry. c. The box is not _ _ for me to carry.2. a. The maths problem isnt easy enough for me to work out. b. The maths problem is _ difficult _ I cant work it out. c. The maths problem is _ difficult _ _ _ work out.3. a. The book is interesting enough foreverybody to
13、 read. b. The book is _ interesting_ everybody likes to readit. Practice Two:He is old enough to go to school. He is _ _ that _ _ go to school.2. She was so weak that she couldnt take care of her baby.She was _ weak _ take care of her baby.Practice Three:1She is so young that she cant go to school.
14、She is _ _ _go to school.2The box is so heavy that he cant carry it. The box is_ _ _ _to carry3Xiao Lin is so old that he can go to school. Xiao Lin is _ _ _go to school.4The box is so light that he can carry it. The box is _ _ for him to carry.5The man is so old that he cant go to work. The man _ _
15、 _to go to work.6The desk is so heavy that I cant move it. The desk _ _ _for me to move.7He is not old enough to do the work. He is _ _ to do the work.8The problem is too difficult for me to work out. The problem _ _ _for me to work out.Practice Four:1. The book is interesting enough for everybody t
16、o read.The book is _ interesting _ everybody likes to read it.2. The boy is so short that he cant reach the buttons of the lift.The boy is _ short _ _ the buttons of the lift.The boy isnt _ _ _ _ the buttons of the lift.Too.to sothat enoughto 练习He is too young to go to school. 他太年幼了以至于不能上学。= He isnt
17、 old enough to go to school. 他的年纪还没有大到足以上学。= He is so young that he cant go to school. 他是如此的年幼,以至于他不能上学。1. He is old enough to go to school. He is _ _ that _ _ go to school.2. She was so weak that she couldnt take care of her baby. She was _ weak _ take care of her baby. 一、sothat与tooto的转换 当that引导的从句
18、为否定式且从句主语与主句的主语相同时,sothat可转换为tooto结构;若从句主语与主句的主语不相同时,sothat可转换为toofor sb to结构。例如: She is so young that she cant go to school. She is too young to go to school. The box is so heavy that he cant carry it. The box is too heavy for him to carry.二、sothat与enough to的转换 1. 当that引导的从句为肯定式时,若从句主语与主句主语相同时,soth
19、at可转换为enough to结构;若从句主语与主句主语不相同时,sothat可转换为enough for sb to结构。例如: Xiao Lin is so old that he can go to school. Xiao Lin is old enough to go to school. The box is so light that he can carry it. The box is light enough for him to carry. 2. 当that引导的从句为否定式时,若从句主语与主句主语相同时,sothat可转换为enough to的否定结构;若从句主语与主
20、句主语不相同时,sothat可转换为enough for sb to的否定结构。同时要注意,转换后的形容词(副词)要用其相应的反义词。例如: The man is so old that he cant go to work. The man isnt young enough to go to work. The desk is so heavy that I cant move it. The desk isnt light enough for me to move.三、enough to的句式为否定式时,enough to可以转换为tooto结构。但转换后的tooto结构中的形容词(副
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