现在完成时讲解+练习共三题.ppt

* 现在完成时态present perfect 现在完成时： 表示过去发生或已经完成的某一动作对现在造成的影响或结果，或从过去开始一直延续到现在的动作或保存的状态。翻译：“已经…/一直……” 结构： 主语+ have / has + 动词的过去分词+…… 一般疑问句： Have / Has +主语+动词过去分词+… ? Yes, I have. No, I haven’t. Yes, she has. No, she hasn’t. … 1. 现在完成时动词构成 have /has + v 过去分词 助动词 否定 haven’t hasn’t 疑问 Have you…? Has he…? 常与下列时间状语连用：just , already, yet, ever, never, before, several times; for, since… have/has done 现在完成时 1.过去发生的动作对现在造成的影响或结果。和already, yet, never, ever, just, before等状语连用。 2.过去已经开始，持续到现在的动作或状态， 常与for或since引起的一段时间状语连用。 have breakfast I have just had my breakfast. (现在我不饿) I’m not hungry now moved here in 2004 I still live here now past I have lived here for three years.我住在这儿已经三年了 I have lived here since 2004 / three years ago / I moved here in 2004. ( 1).for+时间段 ( 2).since+过去时间点 / 时间段+ago/ 过去时的句子 eg.I have been a teacher ______ a year. He has been at this school _______ 1992. We have learned 1,000 English words _______ we came to this school. for since since 注意: 一、瞬间动词不能与for …, since … 等开头的表示一段时间的状语连用（如：come, go , leave, arrive, buy, lose, borrow, join, die, marry ） 二、“already” 用于肯定句；“yet”用于否定句 和疑问句。 不能说: ×1.He has come to Beijing for two years. ×2.He has bought that book for three weeks. ×3.He has joined the Army for one and a half years. ×4.His grandma has died for nine months. ×5. I have received his letter for a month. 可以说: √1.He has been in Beijing for two years. √2.He has had that book for three weeks. √3.He has been in the army for one and a half years. √4.His grandma has been dead for nine months. √5.I havent received his letter for almost a month. Jim has already finished his work. Mother hasn’t come home yet. Haven’t you read The Call of the Wild yet? already yet yet 用already或yet 填空： 现在完成时：表示过去发生或已经完成的某一动作对现在造成的影响或结果，或从过去开始一直延续到现在的动作或保存的状态，强调的是现在的情况。 一般过去时：只表示过去的动作或状态，和现在不发生关系(时间状语：yesterday, last…,…ago, in1990) 现在完成时与一般过去时的区别： h