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北师大版 高三 Module 9 Unit 26 Usages of perfect verb forms General(1) Perfect verb forms are used to link two times(时刻). The speaker is looking back from one point to the time before that. I have lived here for years. (from now to the past) When I got back, they had all left. (from the past to the time before that) I will have finished all my exams. (from a moment in the future to one before that) You can refer to the diagraphs on page 34. General use (2) Have you been waiting long? We had been driving for six hours when we ran out of petrol. Present perfect simple and continuous 根据动词是否连续,可以将现在完成分为两种:强调结果(瞬间动词)和强调过程(延续性动词): Oh, no! The computer has crashed again. (it is not working now.) There has just been a bad accident on the M6. (this is news, affecting people now.) I have been a Manchester United supporter for as long as I can remember. How long have you known each other?
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