too[1]..to...和not..enough_to..的用法

too[1]..to...和not..enough_to..的用法

too …to …. ; not …enough to…

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。

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 .

The snake is too dangerous to hold. The boy is not brave enough to hold it . (改为同义句) 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 elephantthat the girl 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 go to school .

He 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 elephantthat the girl get on it .

2. He ran very fast. He couldn’t stop.

He to stop.

He that he 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.

too[1]..to...和not..enough_to..的用法

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

1. My brother was so clever that he could work out the problem. (改为同义句)

My brother __________________________ work out the problem.

2. The box isn’t light enough for him to carry. (改为同义句)

The box ________________________ for him ________ carry.

3. 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.

4. The water was so dirty. We can’t drink it. (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 is ____________ that fishes ___________ in it.

6. My brother got up late yesterday. He was late for school.

My brother got up ________ that