1. 与表示一段时间的状语连用,表示动作从过去一直持续到现在并可能持续下去,如“ for +段时间(一定是从过去持续到现在)”,“ since +时间点” during the past three years ,how long, lately, recently, in the past few years, these few years, these days, up to now, so far, today, this month。(动作持续发生在这段时间里),谓语动词常为延续性动词。例如:
We have lived in this city for more than 40 years.
我们在这个城市里已经生活了 40 多年。
We have lived in this city since 1958.