高中英语译林版必修二教学案：Unit 1 Section Ⅳ Grammar Writing(含答案).docVIP

Section_ⅣGrammar__Writing 　　　　　　　　　　　　　　　　　　　　　　　　　 语法图解 探究发现 ①I havent seen Justin since ... ②Detective Sam Peterson, who has taken charge of the case, told journalists, ‘Sometimes people make up such amazing stories ...’ ③From our recent survey of students, we have foundthat 53 percent of the students often play sports. ④For centuries, people have reported seeing a wild creature in the Himalayas called Yeti. ⑤Large trackshavealsobeen discovered which some people say belong to the Wild Man. ⑥This incident has received great interest due to reports of strange lights in the sky and of alien visits around the time the boy disappeared. ⑦Ive been writingthe composition for two hours, but I havent finished it yet. ⑧Ihave been wanting to meet you for a long time. [我的发现] (1)句①～⑥中均运用了现在完成时，其谓语动词的构成形式为：have/has＋过去分词。 (2)句⑦⑧运用了现在完成进行时，其谓语动词的构成形式为：have/has＋been＋现在分词，表示过去发生的动作一直持续到现在。 (3)现在完成时有两个基本用法： 一是表示过去发生的动作对现在的影响或结果，如句②③⑤⑥；二是表示过去开始的动作一直持续到现在，并且有可能继续下去，如句①④。 一、现在完成时 1．现在完成时的构成 have/has＋过去分词 2．现在完成时的用法 (1)表示过去发生的动作产生的结果或对现在造成的影响。动作虽然发生在过去，但落脚点在现在。 Iveforgottenhis telephone number. 我忘记了他的电话号码。(没法联系他了) Ihavent finished reading this book yet, so I cant return it to the library. 这本书我还没有看完，所以不能把它还给图书馆。 [即时演练1]　用所给动词的适当形式填空 ①The price has_gone (go) down, but Im not sure whether it will remain so. ②All the windows have_been_painted (paint), and they look new. ③I have_read (read) many reports about the UFO recently. ④(浙江高考改编)—Alvin, are you coming with us? —Id love to, but something unexpected has_come (come) up. (2)表示动作或状态从过去某时开始一直延续到现在，并可能延续下去。常与so far, by now, up to now, since, for a long time, up till now, in the past/last few years 等表示一段时间的状语连用。 He has worked here fortwenty years by now. 到现在为止，他已经在这儿工作20年了。 Up to now, we have receivedno letters from her. 到现在为止，我们没有收到她一封信。 [名师点津]　(1)该用法中的动词多是延续性动词，不能是非延续性动词或趋向动词。 (2)非延续性动词用于否定句可以表示否定的状态，故可以用来表示状态的持续。 (3)由since 引导的时间状语中， since 后面的时间名词必须是“时间点”，而不能是“时间段”；而for 短语中的时间名词必须是“时间段”(有时for 可省去)。 Ive known him since 1980. 我从1980年就认识他了。 H