现在完成时详细讲解完整版第一讲.ppt

What’s your new achievements Three years ago,____________. By now I ____________. When I was ________, I started to _______. By now I __________. 现在完成时 现在完成进行时 过去完成时 现在完成时态 have /has + 过去分词 肯定式：affirmative 主语 + have / has + 过去分词(pp.) I have eaten an apple. 助动词have和has跟前面的主 语缩略为’ve,　’s. 　 如 they=they’ve, 　we have=we’ve, 　　　 he has=he’s,　it has=it’s; 　　否定缩式：has not=hasn’t 　　　 have not=haven’t 二、过去分词的构成 1.+ed 　work, plant,call 2.e+d 　live, change,like,love,agree,save 　　　　 　三．用法（完成、持续、经历、关注） 1、完成（与未完成） 　I have already seen the film. 　　Jim has just lost his book. 　I have already posted the letter. 　　(信已经不在我这儿了)??? I haven’t finished the work yet??.??????????? 　　　　　　　　 　 理解：完成（与未完成） 1、现在完成时用来表示现在之前已发生过或完成的动作或状态,但其结果却和现在有联系,也就是说,动作或状态发生在过去但它的影响现在还存在. I have spent all of my money.(含义是:现在我没有钱花了.) Jane has laid the table.(含义是:现在桌子已经摆好了.) Tom hasn’t finished his homework yet.(含义是:现在仍然在做) He has just returned from abroad. (含义是:现在已在此地) 　　　　　　　　　　 　三．用法（完成、持续、经历、关注） 2、持续 :现在完成时可以用来表示发生在过去某一时刻的,持续到现在的动作（用行为动词表示）或状态（be动词表示）常与for（+时间段）,since（+时间点或过去时的句子）连用. 　　　　　　　　 注　意： (1)since＋一段时间＋ago＝for＋时间段; 　since two weeks ago=for two weeks; I have kept the library book for a week.= I have kept the library book since a week ago. (2)since + 时间点＝for＋时间段 since 2000=for ７ years (3) since+从句(常用一般过去时) The Greens have lived in Beijing since they moved to Beijing from Paris (4)It is /has been +一段时间 + since 从句. 自从某事发生已有一段时间了.? It is /has been two years since my brother joined the army. (5) have got,has got 虽然是现在完成时,但have got=have has got==has I have a new bike=I have got a new bike 　三．用法（完成、持续、经历、关注） 3、经历（或经验） : 现在完成时常常与表示频度的时间状语连用, 如often, sometimes, ever, never, twice, on several occasion ， before等表示经验或经历　　 　4、关注 : （1）非延续性动词 leave, arrive, come, go, return, join, die, buy, borrow 等的完成时，在肯定句中不能与 for 或 since 等引导的时间段连用。但其