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DNA教案

unit 2 dna一. 教学内容:unit 2 dna lesson 13—lesson 16 1. 重点单词n.    laboratory            secret            flutecloset               mammothv.    discussadj.   secret               deadpron.  neitherconj.  nor 2. 重点短语。neither…nor…          既不…也不…say hello to sb.           向某人问好 3. 语法。并列连词的用法。 二. 重点、难点解析及词语辨析1. too many 太多,后面跟可数名词的复数形式。① there are too many people in the park on sundays.星期天公园里人太多。辨析:too much 与 much too▲ too much 太多,后面跟不可数名词② watching tv too much is bad for your eyes.看电视过多对你的眼睛有害。③ i have too much homework to do.我有很多作业要做。▲ much too 很,非常,常用来修饰形容词或副词。④ the coat is much too large for me.这件大衣我穿着实在太大了。 2. i’d like to clone an animal that no longer lives in the world.我想克隆一种世界上再也没有的动物。   (l13)would like 意为“想要”,其语气比用like 婉转些。用法如下:①后面接名词或代词,表示具体“要”某样东西。would you like one of these mooncakes?你想要一块这样的月饼吗?②后面接动词不定式,表示“愿望,喜爱”,用于有礼貌地提出邀请、请求或建议。would you like to come? 你愿意来吗?③当主语是第一人称时,would 可与should 换用,它们都可以缩写为’d , 并且like 也可换成love 。i’m sure he would love to come. 我确信他愿意来。④ “would like” 后面可以用动词不定式作宾语补足语。what would you like me to do? 你想要我做什么?  3. in my laboratory, i would make a new one!在我的实验室里,我要制造一个新的出来。 (l13)one 代词,指代前面出现的人或物中的一个,复数形式为ones。① i haven’t a book, can you lend me one?我没有书,你能借给我一本吗?辨析:one, that与it▲ one 表示泛指,指所提到的东西中的一个,不一定是原物。② i can’t find my hat. i think i must buy a new one. (不确定)我找不到我的帽子了。我想我该去买一顶新的。▲ that表示特指, 与所指名词为同类,但不是同一个。③ the hat you bought is bigger than that i bought. (同类但不是同一个)你买的那顶帽子比我买的大。▲ it也表示特指,与所指名词为同一个。④ i can’t find my hat. i don’t know where i put it. (同一物)我找不到我的帽子了。我不知道我把它放在哪儿了。   4. what about you, brian?  你呢,brian?   (l13)what about + 名词/ 代词/ doing sth./ when 从句意思是 “……怎么样?”“…行吗?”(用于征求意见,询问消息)① i’m twelve years old, what about you? 我十二岁,你呢?(后接代词)② —what about some cakes?  吃点蛋糕好吗?—oh! thank you. 啊,太感谢了。 (后接名词)③ what about going to fly kites?我们去放风筝怎么样? (后接动名词)④ —we stand up when the teacher comes in. 老师进来时我们起立。—what about when he leaves? 老师离开时怎么做? (后接从句)what about 的同义词组为how about, 其用法和 what about 一样。⑤how about playing football now? 现在踢足球怎么样? (后接doing)⑥ how about coming with us to the club?和我们去俱乐部,怎么样? (后接doing) 5. have you heard of cloned animals?  你听说过克隆动物吗? (l13)hear of 听说,得知 = hear about①  i’ve never heard of anyone doing that. 我从未听说有人做那种事。② —who’s he ? 他是谁?—i’ve never heard of him. 我从没听说过他。③ have you heard about julia coming to shanghai?你有没有听说朱莉娅到上海来了? 6. do you have a twin brother or sister?你有一个双胞胎兄弟或姐妹吗? (l14)twin 与 twinstwin  n. &. adj. “双胞胎之一”,只用作定语,常与形容词性物主代词连用.复数形式twins,意思是“孪生儿”“双胞胎”。① lily is her twin sister. 莉莉是她的孪生姐姐。twins 可作主语、表语、宾语。作主语和宾语时常与定冠词the 连用。如:② the twins are in the same class.那对双胞胎在同一个班级。拓展:twins 作主语时,谓语动词必须用复数形式。作表语时twins 一般不与the 连用。③ lily and lucy are twins. 莉莉与露西是双胞胎。 7. does katie want to have another sister?katie 是否想再要一个姐妹呢?   (l14)another 用于泛指三个以上的不定数目中的“ 再一,又一”,后面可以加单数名词,也可以省略后面的名词,用作代词。① i don’t like this coat. please give me another (one).我不喜欢这件外套,请再给我拿一件。▲ another +数字=数字+ more②i have another three days’ holiday. 我有另外三天假期。知识连接:▲ other 作前置定语,修饰单复数名词。③ do you have any other question? 你还有其他问题吗?▲ the other 是表示两者中,特制的“另一个”或“另一部分”。④ they have two children. one is a boy, the other is a girl.他们有两个孩子,一个是男孩,另一个是女孩。▲ others 用作代词,泛指“其他人”或“其他事物”。⑤ some are singing, some are drawing, others are swimming.有些人在唱歌,有些人在画画,其他人在游泳。▲ the others 是指整体中除去一部分之后的全体。⑥ there are 45 students in our class, and 25 of us are boys, the others are girls.我们班有45名学生,其中25名是男生,其余的是女生。  8. she’d better not.  她最好不要。  (l14)had better (常简略为’d better),用于表示对别人的劝告、建议,表示一种愿望。用法如下:a) had better 后面必须跟动词原形。如:you’d better go to hospital at once. 你最好立即去医院看病。b) had better 没有人称和数的变化。如:now you (he, we) had better listen to the teacher.你(他,我们)现在最好听老师讲。c) had better 的否定形式 had better notyou had better not miss the last bus.你最好不要错过末班公共汽车。 9. in front of 在……前面▲in front of    指位于某物体外部的前面,意为“在……的前面”,① there are some big trees in front of the classroom.教室前面有一些大树。(强调在教室的外部)▲in the front of    指在内部的前面② there are two girls reading in the front of the classroom.教室的前面有两个女孩在读书。(强调在教室内部)▲at the front of   相对于地面而言,应将这个位置看成一个点,意为“在……的前面”,反义词为 at the back of③ wei hua sits at the front of the classroom.魏华坐在教室的前面。(强调前面的一点) 10. 不同的“用”a) with 介词“用”,后面常跟表示“某种工具或手段”的名词。i cut the apple with a sharp knife. 我用一把锋利的刀削苹果。tom drew the picture with a pencil. 汤姆用铅笔画画。b) use动词“用,使用”。 mr. is used before the names of men. mr.用在男性姓名前。how do you use a telephone? 你怎样使用电话?c) 介词“用”,后面常跟表示“某种原材料、语言”的名词。we often write in ink. 我们经常用墨水写字。please speak in english. 请用英语讲话。 11. whether 的用法。用在宾语从句中一般可与if互换注意:只用whether 而不用if的几种情况:①与or not 连用时只用whether 而不用if。i don’t know whether or not he can do it well.我不知道他能不能做好这件事。②动词不定式前,只用whether而不用if。i don’t know whether to stay or to leave. 我不知道是留下好还是走开好。③  在介词之后,用whether而不用if.he is worried about whether she is all right. 他担心她是不是痊愈了。 12. 并列连词的基本用法连词是一种虚词,它不能独立担任句子成分而只起连接词与词、短语与短语以及句与句的作用。连词主要可分为两类:并列连词和从属连词。并列连词用来连接平行的词、词组和分句。常用的并列连词有and , but , or , nor , so, therefore, yet, however, for, as well as, both…and, not only…but also, either…or, neither...nor等。▲ 连接两个或两个以上的并列的成分。① he and i are teachers. 他和我都是老师▲ but 用作并列连词,连接两个并列分句,意为“但是,然而”,表示转折意义。② last year he was writing a book about his hometown, but i don’t know whether he has finished it.去年他在写一本关于他的家乡的书,但我不知道他是否已经写完。 ▲ both…and 两者都③ she both spe(请记得收藏本站-一路高升范文网,以获取更多新鲜内容)aks and writes french. 她不但能讲而且能写法语。▲ either…or…或者…或者…;是…还是…,不是…就是…④ you may either stay here or go with us.你待在这里可以,跟我们一起去也可以。⑤ either you or he will go to the party.▲ not only…but (also), as well as 不但…而且……⑥ he has a passion not only for english but also for mathematics.他不仅热爱英语,而且热爱数学。注意:not only…but also连接两个分句时,一个分句因有否定词not而必须倒装。⑦ not only does he like reading stories, but also he can write some.他不但能读故事,而且能够写故事。 

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DNA教案
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