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：
考点一：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.
考点二：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 ?
考点三：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
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