现在完成时PPT.ppt

现在完成时 现在完成时表示过去的动作或存在的状对现在造成的影响或结果，过去的这个动作或状态也有可能持续下去。 1.I have just done my homework. 2.Who has taken my pen? 3.He has lived here since 1992. 4.The bus has just left. 5.They have seen the film already. 一．现在完成时的构成 “主语+助动词have / has + 动词过去分词”。当主语是第三人称单数形式时，要用助动词has,其他形式主语时用助动词have 1.I have had lunch already. 2.She has bought some books 3.The building has been built for three years 三．现在完成时的用法： 1.表示一个动作刚刚结束或完成，但这个动作所造成的状态或影响依然存在，即表示过去的动作对现在的影响或结果，强调现在的情况，常与副词just, already, yet 连用。（注意：already多用于肯定句或疑问句中，yet常用于疑问句或否定句句尾。） 1.We have already known each other. ??2. I have just washed my face. 3.? I haven’t read your novel yet. 2 .表示从过去到现在曾经发生过或经历过某事，表达一种经验或经历，常与副词ever, never, once, twice, before等连用 1. Have you ever seen him before? 2. We have ever been to Hainan many times. 3. I have never seen you before. 3.常与for或since连用。For后接一段时间；since 后接过去的点时间或表示过去时间的时间状语从句。 1. It hasn’t rained since two months ago. 2. He has been in Beijing for over ten years. 3. How many words have you learned since you came here? They have been in this country for more than 3 years. The concert has been on for half an hour. They have been off for a long time. 四.使用现在完成时应注意的几点： 1. have (has)been to 表示“曾经去过或到过某地”，表示一种经历，现在可能还在那里，也可能不在那里了。它可以与ever, never, once, twice等连用。 1. I have been to Australia three times. ?2. Has she ever been there? 2. have (has) gone to表示“某人去某地了”说明那个人不在说话处，其主语常用第三人称。 I didn’t see your father. Where is he? He has gone to Australia. 2.点（瞬间）动词或非延续性动词： ?buy, borrow, leave, join, die, arrive, come, go, begin, start, get, become, lose等，它们不能和表示一段时间的时间状语连用。如： for +一段时间，since引导的表示一段时间的时间状语 用延续性动词或状态动词代替非续性动词。\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ buy--have?/? borrow---keep/ become—be? /die—bedead /marry----be married/ start(begin)---be on/ end (finish)----be over/ join------ be in/ arrive(reach, get to,)---be in/ leave---be off （away）/ 1.I have kept the book for a month. ???2. She has had the bike f