用法: ①.表示动作在说话之前己经完成, 而后果或影响至今仍存在 a. He has gone to Shanghai. ( =He went to Shanghai and he is not here now. ) b. I have opened the window. ( =I opened the window and the window is now open.) c. The concert has started. ( =The concert started and is now going on. ) d. I have had breakfast. (=I had breakfast and I am not hungry now. ) ②.表示开始于过去, 持续到现在的动作或状态, 用于延续性动词, 且句中常带有表示段时间的时间状语 a. I have studied English since 1987. b. He has lived here for two years. c. He has been ill for ten days. 【
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