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。
Ive known him since then. 我从那时起就认识他了。
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 didnt come back until ten oclock.
他到10 点才回来。
He slept until ten oclock.
他一直睡到10点。
典型例题
1. You dont 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.---Im 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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