初中二年级too[1].to.和not.enough_to.课堂讲解用法

1、too to .;noteno ugh to The sn ake is too dan gerous to hold. The boy is not brave eno ugh to hold it . tooto do和notenough to do并让学生明确这两个短语的中文意思是 太而不能”2. The girl / short / get on the elepha nt. / she / not / tall .3. The elepha nt / heavy / carry. / The boy / not strong.4. The elephant / fat / go th

2、rough the gate. / The gate / not wide.5. The mon key / far away / get the banan as. / The bananas / not n ear.6. The cat/ slow/ catch the bird./ It / cannot run/ fast .Step 2抛砖引玉The sn ake is too dan gerous to hold. The boy is not brave eno ugh to hold it .改为 同义句）The sn ake is so dan gerous that the

3、 b 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 sothat +含有can t/ couldn do的否定句等同于tooto do;not eno ugh to do同步操练：1. The girl is too short to get on the elephant.（改为同义句） The girlto get on the elephant. The girl that she get on theelepha nt. The elephant is so tall_ that the girl can giet on it . The elepha

4、nteno ughthe girlget on. The elephanttallthe girlget on.完成句子后求异：与原句比较后发现：由tooto do 结构转换为notenough to do结构 时，要找到句中形容词的反义词。 与 比较后发现：sothat +含有can t / couldn的否定句结构的句子，若主从句的主语不一致时，改写为 tooto do 或notenough 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 hecan t go to school改为同义句）He

5、 too young to go to school .He not old eno ugh to go to school.观察、 两句可得：在tooto do 或notenough 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 get on it .2. He ran very fast. He couldn t s

6、top.He ran too fast to stop.He ran so fast that he couldn tbp.（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 itcan t go through the hole改写为同一意思的句子 ）The holesuch a fat panda to go through.The ice on the lake was so th in that people could n改写为同一意思的句子）The ice on the lake was not eno ugh peopleM

7、r. King is very busy at work. He can t tak改为同o义句y）（Mr. King istake a holiday.My grandfather is too old to travel around.（改为同义句）My gran dfather isoldhetravel around anyStep 4巩固练习1. My brother was so clever that he could work out the problem.（改为同义句）My brotherwork out the problem.2. The box isn t light

8、 eno ugh for him to ca改为同 义句）The boxfor himcarry.3. He is very short . He can t reach the book on合并为一句）He isreach the book on the shelf.4. The water was so dirty. We can t改为同义句）The water was too.5. The water in this river is very dirty. Fishes can t live in it.The water in this river isthat fishesin

9、 it.6. My brother got up late yesterday. He was late for school.My brother got upthatso. . that, too . to和enough to是初中英语教材中的重要结构。在一定条 件下它们可以相互转换，并经常成为中考热点，请看下面三道中考试题：1. The water was so dirty that we could nt drink it.The water wasdirty for usdrink （2001 上海市）2. The child is so young that he cant put

10、 on his clothesThe child isntput on his clothes （99 四川宜宾）3 . The problem is too difficult for me to work out .The problem isntfor me to work out. （2001 重庆市）由分析可知答案为：1too，to 2old enough to 3easy enough那么在什么情况下三者可以相互转换呢？根据其结构特点我们可以看出：、 sothat 与 too to 的转换当 that 引导的从句为否定式时，从句主语与主语的主语相同时， so that 可转换为 t

11、oo 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：He is so young that he cant go to school f He is too young to go to schoolThe box is so heavy thathe cantliftit. f The box is too heavy for him to lift二、so. . . that 与 eno ugh 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， sothat 可转换为 enough to 结

12、构；若从句主语与主句主语不相同时， sothat 可转 换为 enough for sbto 结构。例如：Tom is so old that he can go to school fTom is old enough to go to schoolThe box is so light that the child can liftitfThebox is light enough for the child to lift2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；若从句主语与主句主语不相同时， sotha

13、t 可转换为 enough for sbto 的否定结构。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 workfThe man isnt young enough to go to workThe desk is so heavy that I cant moveitfThe 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（副词）要用其相应的反义词

14、。例如：He is not old eno ugh to do the job. f He is too young to do the jdo.Tom did nt walk slowly eno ugh for us to keep up with him. f Tom walked too fast for us to keep up with him主语 +谓语 v.+too+adj/adv(for sb)+to do ?主语 +谓语 v.+adj/adv+enough(for sb)+to do ?主语+谓语 v.+so+adj/adv(for sb)+that ?从句 变换下列句型：1. a. The box is so heavy that I cant carry it.b. The box is heavy carry.c. The box is not for me to carry.2. a. The maths problem isnt easy enough f