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现在完成时在英语中的使用频率有很高，要是没学好，对英语的日常使用和各种考试而言，影响都会很大。现在完成时不仅是初中英语中最重要也是最难掌握的一个时态，同时它也是中考英语中一个 最重要的时态考点。许多同学对现在完成时的用法似懂非懂，做题时也往往是跟着感觉走。现在完成时表示动作发生在过去，完成在过去，但强调与现在情况仍有联系，其结果或影响仍存在。现在完成时有一些标志性的时间状语：
一：for + 时间段；since + 时间点
They have lived in Beijing for five years.
They have lived in Beijing since 1995.
I have learned English for ten years.
二：常见的不确定的时间状语：lately; recently, just, already, yet, up to now; till now; so far, these days,
Has it stopped raining yet ?
三：在表示“最近几世纪/ 年/ 月以来……”时间状语中，谓语动词用现在完成时。
in the past few years/months/weeks/days；over the past few years;
during the last three months; for the last few centuries, through centuries; throughout history 等
四：表示“第几次做某事，”或在 “It is the best (worst, most
interesting ) +名词 ＋that” 后面跟现在完成时。
This is my first time that I have visited China.
This is the most interesting film I have ever seen.
That is the only book that he has written.
