1、现在进行时

    表说话时或目前一段时间内正在进行的活动：或表感情色彩，加强语气。与频率副词，如always，constantly，continually，again等连用表示说话人的某种感情色彩（赞叹、厌烦、埋怨等）。

We are having English class.

The house is being built these days.

The little boy is always making trouble.

考点一：在时间状语或条件状语从句中表示将来正在进行的动作。

Look out when you are crossing the street.
Don’t wake him up if he is still sleeping at 7 tomorrow morning.

考点二： 表示在最近按计划或安排要进行的动作（这时多有表示将来的时间状语）。

Marry is leaving on Friday.

    3、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
 考点四：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.