too...to...-与-enough...to...-与-so...that...的区别.doc

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...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 can't go to school.
too …to …. ; not …enough to…
Step 1 看图说话 利用课本P36页的图画和提示词练说 too…to do 和not … enough to do 句子。如：1. The snake / dangerous/ hold . / The boy not brave
The snake is too dangerous to hold. The boy is not brave enough to hold it .
板书 too…to 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. 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 snake 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can’t / couldn’t do的否定句等同于too…to 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)
①The girl _________________________ to get on the elephant.
②The girl ____________that she ___________ get on the elephant.
③The elephant is so tall__ that the girl can’t get on it .
④The elephant _________ enough ______ the girl ______ get on.
⑤The elephant __________tall ______ the girl _______ get on.
完成句子后求异：
①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。
③与④比较后发现：so… that + 含有can’t / couldn’t 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 ，若主从句的主语一致，则不须添for sb。如：
He is so young that he can’t 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④ 、⑤ 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 tall__ that the girl couldn’t get on it .
2. He ran very fast. He couldn’t stop.
He ran too fast to stop.
He ran so fast that he couldn’t 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 can’t 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 so thin that people couldn’t 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 can’t 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 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 isn’t light enough for him to carry. (改为同义句)
The box ________________________ for him ________ carry.
He is very short . He can’t reach the book on the shelf.(合并为一句)
He is ________________________ reach the book on the shelf.
The water was so dirty. We can’t drink it. (改为同义句)
The water was too __________________________________ .
The water in this river is very dirty. Fishes can’t 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 ________ that
Practice One :
　　1. a. The box is so heavy that I can't carry it.
　　 b. The box is ________ heavy______ ________ ________ carry.
　　 c. The box is not ________ ________ for me to carry.
　　2. a. The maths problem isn't easy enough for me to work out.
　　 b. The maths problem is ________ difficult ________ I can't work it out.
　　 c. The maths problem is ____ difficult ________ ______ _____ work out.
　　3. a. The book is interesting enough for　everybody to read.
　　 b. The book is _____ interesting________ everybody likes to read　it. 　　
Practice Two:
He is old enough to go to school.
He is __________ __________ that __________ __________ go to school.
2. She was so weak that she couldn’t take care of her baby.
She was __________ weak __________ take care of her baby.
Practice Three:
1 She is so young that she can’t go to school.
＝She is ________ _________ ______go to school.
2 The box is so heavy that he can’t carry it.
＝The box is________ _________ ________ _______to carry
3 Xiao Lin is so old that he can go to school.
＝Xiao Lin is ______ _________ ________go to school.
4 The box is so light that he can carry it.
＝The box is _________ ____________ for him to carry.
5 The man is so old that he can’t go to work.
＝The man __________ __________ _______to go to work.
6 The desk is so heavy that I can’t move it.
＝The desk _________ _________ __________for me to move.
7 He is not old enough to do the work.
＝He is _________ _________ to do the work.
8 The 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 to read.
The book is ____ interesting ____ everybody likes to read it.
2. The boy is so short that he can’t reach the buttons of the lift.
The boy is ____ short ____ ____ the buttons of the lift.
The boy isn’t ___ ____ _____ _____ the buttons of the lift.
Too..to so…that enough…to 练习
He is too young to go to school. 他太年幼了以至于不能上学。
= He isn't 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 can't 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 couldn’t take care of her baby.
She was __________ weak __________ take care of her baby.
一、so…that与too…to的转换
当that引导的从句为否定式且从句主语与主句的主语相同时，so…that可转换为too…to结构；若从句主语与主句的主语不相同时，so…that可转换为too…for sb to结构。例如：
She is so young that she can’t go to school. ＝She is too young to go to school.
The box is so heavy that he can’t carry it. ＝The box is too heavy for him to carry.\
二、so…that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，so…that可转换为enough to结构；若从句主语与主句主语不相同时，so…that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，so…that可转换为enough to的否定结构；若从句主语与主句主语不相同时，so…that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 can’t go to work. ＝The man isn’t young enough to go to work.
The desk is so heavy that I can’t move it. ＝The desk isn’t light enough for me to move.\
三、enough to的句式为否定式时，enough to可以转换为too…to结构。但转换后的too…to结构中的形容词（副词）要用其相应的反义词。例如：
He is not old enough to do the work. ＝He is too young to do the work.
The problem is too difficult for me to work out. ＝ The problem isn’t easy enough for me to work out.改写同义句，每空一词。
    1. The book is interesting enough for everybody to read.
    The book is ____ interesting ____ everybody likes to read it.
    2. The boy is so short that he can’t reach the buttons of the lift.
    The boy is ____ short ____ ____ the buttons of the lift.
    The boy isn’t ___ ____ _____ _____ the buttons of the lift.
八年级 so...that; ....enough....;too...to专项练习
1.He is old enough to go to school.
He is __________ ________ that _________ _________ go to school.
2. She was so weak that she couldn’t take care of her baby.
She was __________ weak __________ take care of her baby.
3.She is so young that she can’t go to school.
She is ________ ________ _________ go to school.
4.The box is so heavy that he can’t carry it.
The box is ________ _________ for him_______ carry.
Xiao Lin is so old that he can go to school.
Xiao Lin is _______ ________ _________ go to school.
6.The box is so light that he can carry it.
The box is ________ _______ for him ______ carry.
7.The man is so old that he can’t go to work.
The man ________ _________ old _________ go to work.
8.The desk is so heavy that I can’t move it.
The desk is ________ ________ for me ____move.
He is not old enough to do the work.
He is _______ ________ ________ do the work.
10.The problem is too difficult for me to work out.
The problem isn’t _______ _______ _______ _____ to work out.
11. The book is interesting enough for everybody to read.
The book is ________ ________ ________ everybody likes to read it.
12. The boy is so short that he can’t reach the buttons of the lift.
The boy is ________ _______ _______ _______ the buttons of the lift.
The boy isn’t _______ ________ ______ ______ the buttons of the lift.
13.The water was so dirty that we couldn't drink it．
The water was _______ dirty for us _______ drink．
14.The child is so young that he can't put on his clothes．
　The child isn't _______ _______ _______ put on his clothes．
15.The problem is too difficult for me to work out．
　The problem isn't _______ ______ ________ for me to work out．
He is so young that he can't go to school．
He is ______ young ______ go to school．
17.The box is so heavy that he can't lift it．
The box is _______ heavy ______ ______ _____ lift．
Tom is so old that he can go to school．
Tom is _______ _______ to go to school．
19. The box is so light that the child can lift it．
The box is _______ ________ ________ the child to lift．
so…that 、such…that、so that的用法练习题
一．用so,such填空
he was_______excited that he couldn't get sleep
this teacher is_________kind that we all like him
he ran____________quickly that we all couldn't catch up with him
this is_____________interesting a book that we all ebjoy reading it
they are__________intereting books that we all enjoy reading them
he has________many books that I can't count them
this is________ an interesting book that we all enjoy reading it
there was ____much food that we couldn't eat it all
I have___little money that I cannot afford a car
he is _____a good student that we alll like him.
he is ______good a student that we alll like him.
it was ____bad weather that he had to stay at home.
I've had ______many falls than i'm blick and blue all over
二．填空
The little boy saved every coin_________ __________he could buy his mother a present on Mother's day
.当球迷们看到贝克汉姆的时候，他们如此激动以致于大喊大叫。(根据中文意思完成句子，每空一词。)(2003北京市海淀区)
When the football fans saw Beckham, they got________excited_____they cried out.　　
. David was so careless that he didn't find the mistakes in his test paper. (变为简单句)(2003福州市)
David was__________careless__________find the mistakes in his test paper.
A：The boy is so young that he can't look after himself.
B：The boy is not______to look after himself.(改写句子，使B句与A句意思相近)
. The stone is so heavy that I can't lift it up.
It is__________a heavy stone__________I can't lift it up.(改写句子)
The book is______ interesting______I want to read it again
It was______a fine day______we couldn't wait to go out for a walk
Jim is ______clever______he can work out this difficult problem easily
My cousin ran______fast ______I couldn't catch up with him
He left in______a hurry______he forgot to close the window
They are______lovely students______the teacher like them very much
Mr Zhang is______good a teacher______all the students like him
Bob has______few friends______he often feels lonely
三．单项填空。
She bought a digital camera online she would save a lot of time. (2003扬州市)
A.so that B.as soon as C.no matter D.such that
.—___fine day it is today! —Yes,the sunshine is___beautiful that I'd like to go swimming in the sea. (2003青岛市)
A. How, such B. What a, very C. How, so D. What a, so
The camera is _____expensive___ I can't afford it. (2004年辽宁省)
A. so, that B. such, that C. so, as to D. enough, that
. Miss Gao asked a question, but it was____that nobody could answer it.　　
A.very difficult B. too difficult C. difficult enough D. so difficult
To my surprise,he could get over ____ difficult problems that he succeeded at last.
A.so B.such

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一．用so,such填空
so
so
so
so
such
so
such
so
so
such
so
such
so
二．填空
so that
so，that
too , to
old enough
such, that
so...that...
such...that...
so...that...
so...that...
.such...that...
.such...that...
.so...that...
8.so...that...
三．单项填空。
A
D
D
A
B

so...that... 如此……以致于……...so that... 以便于，为了
“so...that...”句型的意思是“如此/这么……以致于……”，常引导结果状语从句，但“so...that...”是个爱“变脸”句型，你一不留意就会出错。“so...that...”句型及其转换也是中考的热点，现将其用法总结归纳如下，让我们一起来看看它是怎样变的吧。
一、 so... that...句型中的so是副词，常常用来修饰形容词或副词，常用句型为：主语+谓语+so+adj. / adv. + that从句。例如：
1. he is so young that she can't look after herself.
2. The boy ran so fast that I couldn't catch him.
3. He was so angry that he couldn't say a word.
二、 在“such... that...”句型中，such修饰名词，意思也是“如此……以致于……”但当名词前有many、much、(a) few、(a) little等词修饰时，句子中要用“so...that...”而不能用“such...that...”。例如：
1. He has so much money that he can buy what he wanted.
2. I've had so many falls that I have pains here and there.
3. There is little water in the glass that I can't drink any more.
三、 so与that也可连起来写，即变成：... so that ...(以便 / 为了……)，引导目的状语从句。例如：
1. I got up early so that I could catch the early bus.
2. Please open the window so that we can breathe fresh air.
3. You must go now so that you won't be late.
四、以“so...that”引导的结果状语从句可以转换成不定式的简单句，即可转换为“...enough to...”或“...too...to”句型，但这种转换必须符合下列条件：
1. 当主句和从句的主语一致，且that从句是肯定句时，可用“enough to do sth.”来转换。如：
The man is so strong that he can lift the heavy box.→
The man is strong enough to lift the heavy box.
He was so clever that he can understand what I siad. →
He was clever enough to understand what I siad.
2. 当主句和从句的主语不一致，且that从句是肯定句时，可以用“enough for sb. to do sth.”来替换，但须注意不定式的宾语要省略。例如：
The question is so easy that I can work it out. →
The question is easy enough for me to work out.
The box is so light that he can carry it. →
The box is light enough for him to carry.
3. 当主句和从句的主语一致，且that从句是否定句时，可以用“too...to”来替换。例如：
The girl is so young that she can't dress herself. →
The girl is too young to dress herself.
I was so tired that I couldn't go on with the work. →
I was too tired to go on with the work.
4. 当主句和从句的主语不一致，且that从句是否定时，如果要用“too...to...”替换“so...that...”，则用介词for引出动词不定式的逻辑主语，可以用“too...for sb. to do sth.”来替换，注意不定式的宾语要省略。
The bag is so heavy that she can't move it. →
The bag is too hea