八年级英语下学期 Unit 1复习课件.ppt

二、现在完成时的构成1. 现在完成时的肯定句句型  主语（第一、二人称单、复数)+have  主语（第三人称复数） +have +过去分词 主语（第三人称单数） +has 2. 现在完成时的否定句句型 主语+have/has+not+过去分词+…… I have not seen the movie yet. He hasn’t been to Beijing since then We have lived in Beijing. He has lived in Beijing. I have finished my homework. 3.现在完成时的一般疑问句句型 Have/Has+主语+过去分词+…. Have you finished the work? Has she arrived here? 4.现在完成时的特殊疑问句句型 特殊疑问词+have/has+主语+过去分词+……. How many times have you been to the Great Wall? 三、现在完成时的标志词 标志词(1)：这种用法常与already, just, yet, ever, never, recently,before(句末)等连用 1.I ________ (do) my homework already. 2.He _____________(not finished) his homework yet. 3.____you ever _____(be) to Beijing? 4.We ______ never ______ (see) such an exciting match before. 5.Mother _____ just _______(clean) the house. Please don’t come in. 6.They _________________(practice) this dialogue twice. have done has not finished Have been have seen has cleaned have practiced 注意：当在肯定陈述句中含有already或just 时，在转换成否定句或疑问句时，要把句中的already 或just 去掉，在句末加上yet. I haven’t seen the film yet. 2 I have done my homework already. I haven’t done my homework yet. 3. Mother has just cleaned the house. Mother hasn’t cleaned the house yet. 1 I have seen the film already. 标志词（2）：这种用法还可与 for +一段时间, since+过去的时间点, these years, so far, in the past/last …years等连用 1.We __________ (learn) English for three years/ since two years ago/since 2000. 2.Mr. Green _________ (be) in China these years. 3.They ____________(write) 15 songs so far. 4.The population ____________ (grow) more slowly in the past ten years. have learned has been have written has grown Attention: since的用法 1. Since+ 过去某个时间（此时 since充当介词） Eg: He has been in this school since 1999. 2. Since+一段时间+ ago （此时 since充当介词） Eg: She has known Susan since seven years ago. 3. Since+ 从句 （此时 since充当连词）（此时主句使用完成时，从句则要使用过去时） Eg: I have lived here since I was born. 4.当主句的谓语动词为be或seem时，则主句要采用一般现在时,从句仍使用过去时。 Eg