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功能及意义 1. 表示一个动作发生在过去，对现在仍有影响，但没有具体的过去时间修饰。 常由下列副词修饰： ever曾经 never从不 already已经 yet还(未)(yet只用在否定句和疑问句中) just刚刚 recently最近 lately近来 so far 迄今为止= until now, up to now， before 以前 例：Have you ever been to the Great Wall? 你曾经去过长城吗? I have never heard of such a man. 我从没有听说过那个人。 We have just had lunch. 我们刚刚吃过午饭。 I have already returned your money. 我已经把钱还给你了。 I haven't found my book yet.(否) 我还没有找到笔记本。 Have you done your homework yet? (疑)你做作业了吗? Have you heard from him recently ? 你最近收到他的来信了吗? So far, no one has made any mistakes yet. 迄今为止，还没有人犯错误。 I have never traveled by plane before. 我以前从来没有乘飞机旅行过。 2. 表示一个动作发生在过去，一直持续到现在刚刚结束或者仍在继续。常常与下列时间状语连用： →for +一段时间 I have learned English for 8 years. →since +过去的一个时间点 I have learned English since 2001. →since +一段时间+ ago I have learned English since 8 years ago. →since + 时态为一般过去时的时间状语从句 I have learned English since I was 5 years old. → in the past/last +时间段 Great changes have taken place in my hometown in the past ten years. 近十年来我的家乡发生了巨大的变化。 (责任编辑：admin) |