现在完成时PPT课件.ppt

现在完成时 Present Perfect Tense 教 材 典 句 1．I have written three e-mails in English today. 2．She has helped me with my maths homework a lot. 3．I havent seen you since Tuesday. 4．—Have you found any Chinese music? —Yes, I have. 5．What have you done in your favourite class? 1. 概念 表示过去发生的某一动作对现在造成的结果或影响。 一般可以翻译为汉语中的“...过” ,“...了” , “已经...” I have visited the Great Wall. 2， 构成及结构 肯定句：主语+have\has+过分 否定句：主语+havent\hasnt +过分 疑问句：一般疑问句 Have\Has +主语+过分+其他 特殊疑问句 疑问词+主语+过分+其他 一般疑问句的回答： Yes，主语+have\has No，主语+havent\hasnt 1. 规则动词：与过去式变化相同。 　　(1) 一般+-ed 　　 work---worked---worked 　　(2) 以“ e ”结尾, + - d 。 　　 live---lived ---lived 　　(3) “辅音字母 + y” 结尾，y 变 i, + -ed。 　　 cry---cried---cried 　　(4) 重读闭音节结尾(辅元辅)，双写后+-ed 。 　　 drop---dropped--dropped 2 、不规则动词，见不规则表（p144） 动词过去分词 变化规则 达标小检测 Jim finished his homework. (改为现在完成时) We have visited Beijing. （改为否定句和疑问句并做肯定,否定回答） Jim has finished his homework. We haven’t visited Beijing. Have you visited Beijing? Yes, we have\No,we haven’t. More examples I have written three e-mails in English today. I have written three e-mails in English today. I have written three e-mails in English today. 3, 常连用的时间状语 already，yet，ever，never，just，before，many times，several times，so far， up to now，resently，in the past 3 years等 I have already finished my work. Have you ever seen this film ? 4. 用法 1》表示动作到现在或说话时已经完成或刚刚完成 I have just finished my work . We have set up many new factories resently. 2》动作发生到过去，强调对现在产生的结果或造成的影响 Have you seen the film “Harry Potter” ? Ive spent 3 years in the countryside. 　　 过去完成的动作对现在有影响,用以下四大标志词可以表达这种含义: 以already, just和yet为标志 以so far为标志 以ever和never为标志 以动作发生的次数为标志 以already, just和yet为标志 already, just和yet 表示到现在为止动作或状态已经、刚刚或还没有发生。 He has already got her help.　他已得到她的帮助。He has just seen the film.　他刚刚看过这场电影。He hasn‘t come back yet.　他还没有回来。 以so far为标志so far往往表示到目前为止动作或状态已经发生。He has got to Beijing so far.　到目前为止他已到了北京。She has passed the exam so far.　到目前为止她已经通过了