现在完成时1 构成 助动词 have/has + 过去分词例:肯定句 I have worked. He has worked.否定句 I have not (havent ) worked. He has not (hasnt )worked .疑问句 Have you worked ? Has he worked ?回答Yes，I have. / No , I havent . Yes, he has./ No, he hasnt.2 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，lately近来， so far 迄今为止= unti
