短暂性动词，延续性动词和现在完成时
短暂性动词是指动作一旦发生就立即结束。它不能和一段时间连用。这类动词有：go, come, arrive, leave, begin, start, join, marry 等；短暂性动词的肯定式不能与表示一段时间的for或since或how long等状语连用。例如：
His father got ill. I have received his letter.
但是，不可以说：His father got ill for a week.
I have received his letter for three days.
在否定句中，短暂性动词可以和表示一段时间的状语连用。例如：
We haven’t heard from Jane for a long time.
I suppose something must have happened to her.
延续性动词是指动作发生后还可以延续一段时间或者相当长的一段时间。如：live, work, study, learn, sleep等，延续性动词可以和表示一段的时间状语连用。
追答如果短暂性动词与表示一段时间的时间状语连用，必须将短暂性动词改为延续性动词。
追问就是说只要不和一段时间连用就可以用短暂性动词…………对吧
追答对哒
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