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。
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。
解析: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。
解析:等待的动作由过去开始,持续到现在,应用现在完成时。