初中一年级英语第一册enogh等的用法及练习.ppt

1.too …to …. ： “太… 而不能…” 2.not …enough to… ：“做 …而不够…” 3.so…that…: “如此….以至于…” 4.such…that…“如此….以至于…” too …to …. ; not …enough to… Step 1 利用提示词练说 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 . too…to do意思是 “太… 而不能…” not … enough to do… “做 …而不够…” 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 _ _ that 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 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 coul