现在完成时和过去完成时的标志词（现在完成时与现在完成进行时构成）

现在完成时和过去完成时的标志词（现在完成时与现在完成进行时构成）时间标志词：for 时间段，since 时间点， in the past 时间定义：动作从过去开始，一直持续到现在，有可能到将来，强调动作一直在进行。already，never，just，before，recently，for 时间段，since 时间点，in the past 时间二、现在完成进行时构成

一、现在完成时

构成

定义：动作从过去开始，一直持续到现在结束，强调对现在有影响。

常用的时间标志词：

already，never，just，before，recently，for 时间段，since 时间点，in the past 时间

二、现在完成进行时

构成

定义：动作从过去开始，一直持续到现在，有可能到将来，强调动作一直在进行。

时间标志词：for 时间段，since 时间点， in the past 时间

三、现在完成时和现在完成进行时的区别

练习题：

1、Great changes have taken (take) place in my hometown during the past three decades.

2、— Oh no! We’re too late. The train has left (leave).

— That’s Ok. We’ll catch the next train to London.

3、Despite the previous rounds of talks no agreement has been reached (reach) so far by the two sides.

4、This tower is the second building that it has been built(build) in ChongQing.

6、 Zhang Ning is taking notes of the grammatical rules in class and she has been studying（study） English for a year.

7、--Mum I really think Dad should have a break and get relaxed.

---Yes. He has been reading (read) too long.

持续更新中