全国大众英语测验语法——一连动词与瞬间动词
1)用于完成时的区别
一连动词默示履历、经历；瞬间动词默示活动的功效，不能与默示段的时候状语连用。
He has completed the work.他已完成了那项义务。 (表功效)
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
一连动词用于一定句，默示"做……直到……"瞬间动词用于否定句，默示"到……，才……"
He didn't come back until ten o'clock.
他到10点才返来。
He slept until ten o'clock.
他不断睡到10点。
典范例题
1. You don't need to describe her. I ___ her several times.
A. had metB. have met C. metD. meet
谜底B.首先本题后句夸张对现在的影响，我晓得她的模样，你不用描绘。再次，several times告知为频频发作的举措，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. wasD. will be
谜底A.期待的举措由过往开始，继续到现在，使用现在完成时。