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They have put up a lot of high-rise buildings recently.
John Martin: Oh, look at that huge apartment block!
Xiao Li: Yes, they have just completed it.
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Conclusion：现在完成时表示一个从过去某一刻开始延续到现在的动作或状态，这个动作或状态也许还会持续下去，常与for,since或一段时间连用。（现在完成时的未完成用法）
Am I right in thinking that you have lived here all
your life?
The family has lived in this town for twenty years.
He has studied English since he was 12 years old.
I have known him since last December.
What’s the Present Perfect Tense?
什么是现在完成时
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I have seen quite a lot of China.
We have started a holiday club for children.
They have put up a lot of high-rise buildings recently.
It has been very successful, so far.
Have you collected any information about occupations?
— Has Tom left our town?
— Yes, he has.
— And how long has he been away?
— About two hours.
肯定句：主语 + have/has + 过去分词.
It has not been very successful yet. (has not=hasn’t)