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现在完成时的结构
注：主语若是第三人称单数助动词用 has
1.都表示过去发生的事
2.现在完成时强调过去和现在的联系，不能和具体的时间状语连用；
3.一般过去时强调过去发生的事或状态与表示过去的具体时间连用（last, ago, yesterday, etc. ）
present
past
I have lived here for two years
I lived there 2 years ago
和过去时态的区别及联系：
·
·
2007
2009
Eddie was born four years ago.
past
present
Eddie has lived with Millie since he was born.
past
present
Eddie has lived with Millie for four years.
We use the present perfect tense to talk about
things that started in the past and continue
to the present.
We also use the present perfect tense to talk
about things that happened in the past and
have connection with the present.
move
live
love