现在完成时、过去完成时、现在完成进行时

实用标准 文档 知识点①：现在完成时 一.一般现在时用法： ①过去发生的动作对现在造成的影响或结果：强调结果 e.g. Yesterday I finished my homework, that’s to say, I have finished my homework now. ②过去已经开始一直持续到现在的动作或状态：强调继续 e.g. I have lived here since 1990. 二. 现在完成时的构成 have/has+过去分词 三. 现在完成时的四个基本句型 肯定句 He has finished the work. 一般疑问句 Has he finished the work? 否定句 He has not finished the work. 两回答 Yes ,he has. / No, he hasn’t. 特殊疑问句 What has he done? 四. 在下列情形下用现在完成时 （1）九词语 ①already 已经 肯定句中或句尾 e.g. I have already found my pen. = I have found my pen already. ②yet 已经 否定句和疑问句句尾 e.g. I have not finished the work yet. Have you bought a computer yet? ③ever 曾经 句中 e.g. Have you ever seen pandas? ④never 从不 句中 e.g. I have never been to Beijing. ⑤just 刚刚 句中 e.g. I have just done my work. 实用标准 文档 ⑥before 以前 句尾 e.g. I have never been there before. ⑦so far 到目前为止 e.g. So far he has learnt 200 words. ⑧how long 多久 e.g. How long have you lived here? ⑨how many times 多少次 e.g.How many times has he been to Beijing? （2）两词组 havegone to 去了某地 例：He has gone to Beijing (去了北京) havebeen to 去过某地 例：He has been to Beijing. (去过北京) （3）两结构 for two months for +一段时间 Jim has lived here for 2 months. since last year since +过去点时间 Lucy has been in Beijing since 3 years ago. since 3 years ago since 1990 since he came here since +过去时态句子 He has been in China since he came here. （4）如果句子里面没有时间状语，汉语意思能够加“已经”，往往用现在完成时态。 e.g. Have you lost your library book? 你已经弄丢了从图书馆借的那本书吗？ （5）现在完成时态还常常用于下列句型 They...