1) 用于完成时的区别 延续动词表示经验、经历; 瞬间动词表示行为的结 果,不能与表示段的时间状语连用。 He has completed the work.他已完成了那项工作。 (表结果) I've known him since then. 我从那时起就认识他了。(表经历) 2) 用于till / until从句的差异 延续动词用于肯定句,表示"做……直到……" 瞬间动词用于否定句,表示"到……,才……" He didn't come back until ten o'clock. 他到10 点才回来。 He slept until ten o'clock. 他一直睡到10点。 典型例题 1. You don't need to describe her. I ___ her several times. A. had met B. have met C. met D. meet 答案B. 首先本题后句强调对现在的影响,我知道她的模样,你不用描述。再次,several times告知为反复发生的动作,因此用现在完成时。 2.---I'm sorry to keep you waiting. ---Oh, not at all. I ___ here only a few minutes. A. have been B. had been C. was D. will be 答案A.等待的动作由过去开始,持续到现在,应用现在完成时。
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