Unit8SectionA3a-3cGrammarFocus课件：2021-2022学年人教版八年级上册英语.pptxVIP

Unit 8　How do you make a banana milk shake?Section A 3a-3cGrammar FocusTeaching Aims：1.掌握祈使句的用法2.掌握可数名词和不可数名词的考点3.how many和how much的辨析Teaching key difficult points:1. 祈使句句型的掌握2. 可数名词的变化和不可数名词用法3.how many和how much的辨析Lead-inNo smoking!Turn left!Turn right!Don’t play football!Don’t eat!Be careful!一、祈使句?祈使句的定义祈使句 : 表示__________________等句子。请求、命令、建议?祈使句的运用: ①在祈使句中，一般以________开头。主语是______,通常被______。②句首或句尾常加“________”,表示“请”。在句尾时前用逗号与前面句子隔开。动词原形省略youpleaseDiscussion ?句型1．肯定形式（动词原形开头）eg.Be careful！ Be quiet, please!A）be 型（Be+表语） B）do 型（实义动词原形+其他） eg. Come in, please!Stand up! C）let 型（Let+宾语+动词原形+其他） eg. Lets go shopping!.2．否定形式（Dont+动词原形开头）eg. Dont be late!Dont be noisy!A）be 型（Dont be+表语）B）do 型（Dont+动词原形+其他）eg. Dont sleep now!Dont talk in class!C）let 型（①Dont+let+宾语+动词原形+其他）eg. Dont let them leave. Lets not go out!（②Let+宾语+not+动词原形+其他）?特殊用法(了解)1.No+doing/名词：用来表示“禁止”的祈使句。 eg.No smoking！禁止吸烟！No parking! 禁止停车！ No fishing！禁止钓鱼！No photos! 禁止照相！2. Do+动词原形：用来加强语气 eg. Do write to me soon. 一定要快点给我写信啊。 Do let me do it by myself. 请一定要让我自己处理。Task 11. _______(keep) quiet in the library!2. Dont _______(swim) in the river, please!3. Please dont ____(be) late for school tomorrow!4. Lets ________(not make) any noise, the baby is sleeping.5. 对你的朋友好点！________________ your friends!6. 确保拼尽全力！ Make sure ______________________________!7. 走之前别忘了关门！________________________ before you leave!8. 让我们去远足吧！___________________!Keepswimbenot makeBe friendly toto try your best/ you try your bestDont forget to close the doorLets go hiking二、可数名词1.可数名词的单数：前常加不定冠词a/ an 或定冠词the(特指)eg. a pilot 一名飞行员an apartment 一所公寓 the man with a hat 那个戴帽子的男人2. 可数名词变复数：规则变化 不规则变化boys students photos(无生命)①规则变化：A)一般情况直接+s:B)以s, x, sh, ch等结尾加-es:buses boxes dishes watchesC)以辅音+y结尾改y为i加-es:babies factories cities D)以f(e)结尾,改f(e)为ves:leaves knives wives wolvesE)以o结尾(有生命)加-es:potatoes tomatoes heroesTask 2将下列名词变为复数： 1. hen __________ 2. diary _________ 3. activity _________ 4. difference _________ 5. duck __________ 6. d