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。例如:
    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……"。例如:
    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。
