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（第三人称单数用has，其余都用have）
规则动词的过去分词与过去式一样，不规则动词的过去分词要以不规则动词表为准。
① 表示过去发生的某一动作对现在造成的影响或结果，常与 already (已经) / yet (已经)
ever (曾经) / never (从不)
just (刚刚) / before (以前) / so far(到目前为止)等
连用。
---Have you had your lunch yet?
---Yes, I have. I've just had it.
2. 基本用法
②表示从过去开始持续到现在的动作或状态，常与for+时间段或since＋时间点或since+从句（一般过去时）; in the last / past few years(在过去几年间)等时间状语连用。
Eg: I have known Li Lei for three years.
She has taught here since I came to this school.
2. 基本用法
1. The Browns _________ (live) in China for ten years.
2. My father ______________ (work) in the factory since the factory opened.
3. We _______________ (study) English for four years.
4. He won’t go to the cinema tonight because
he ____________(see) it already.
体验成功： 练 习
have lived
has worked
have studied
has seen
现在完成时的句式
肯定句
否定句
疑问句
答语
I have worked.
I have not worked. (=haven’t)