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1.过去发生的动作或已经完成的某一动作对现在造成的影响或结果。和already，never,ever,just,before,yet等状语连用。
2.过去已经开始，持续到现在的动作或保存的状态，常与for或since引起的一段时间状语连用。不能是具体 的过去时间。
have breakfast
I have just had my breakfast.
(现在我不饿)
I’m not hungry now
moved here
in 2004
I still live here
I have lived here for three years.
I have lived here since 2004/three years ago.
now
past
1. 现在完成时动词构成
have /has + v 过去分词
助动词
否定
haven’t
hasn’t
疑问
Have you / they / Tom and Jack…?
Has he / she / Kate…?
He has finished his homework.
He has not finished his homework.
Has he finished his homework?
Yes, he has./No,he hasn't.
They have lived here for two years.
They have not lived here for two years.
Have they lived here for two years?
Yes, they have./No,they haven't.