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肯定式
否定式
I/You/We/They have finished the work.
He/She/It has finished the work.
I/You/We/They have not finished the
work.
He/She/It has not finished the work.
构成：
have(助动词) + p.p
has(第三人称单数助动词) + p.p
疑问式
回答
Have I/you finished the work?
Has he/she finished the work?
Yes, you/I have.
No, you/I haven’t.
Yes, he/she has.
No, he/she hasn’t.
have not 常缩略为haven’t
has not 常缩略为hasn’t
现在完成时的用法
Have you had your lunch yet?
Yes, I have. I have just had it.(现在我不饿了）
表示过去发生或已经完成的动作对现在造成的影响或结果。
I haven’t seen her these days.
I have known Bob for three years.
I’ve been at this school for over two years.
They have lived here since 1982.
She has taught us since I came to this school.
某些动词的现在完成时可表示过去某一时间开始并一直持续到现在（包括现在）的动作或者状态，可以和表示延续的时间状语连用。表示持续动作或状态的是延续性动词。