现在完成时既可表示过去发生的动作对现在所造成的结果或影响(此时通常连用的时间状语有already, yet, just, ever, before),也可表示动作从过去某时间开始,一直持续到现在,并且还有可能持续下去(此时通常连用的时间状语有this month / week / year, these days, recently / lately, in the past few + 时间段, since +时间点, for + 时间段)。如:
I have just finished my work. 我把工作做完。
Have you ever been to Beijing? 你曾经去过北京吗?
I have lived for ten years. 我在这儿住了十年了。
We have studied here since 2003. 我们自2003年来就在这儿读书了。