完成时的标志有哪些?

题目

完成时的标志有哪些?

答案

现在完成时
表目前已完成的动作,强调对现在的影响.时间是算到你说话的时候为止,而且现在完成时有一些标志性的时间状语：
1．for+时间段；I have learned English for ten years．
2．常见的副词：lately；recently, just,up to now, till now,
so far, these days,
in the past few years／months／weeks／days
3．注意：for+时间段；since+时间点
They have lived in Beijing for five years．
They have lived in Beijing since l995．
4．This is the first time that I have watched stars through a telescope．
第几次做某事,后面跟现在完成时.