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英语时态之现在完成时
现在完成时表示过去发生的动作对现在造成的影响或导致的结果，本篇是CN人才小编为大家收集整理的英语现在完成时的相关内容，希望对大家有所帮助，欢迎阅读。
结构
1) 肯定形式：S. have/has +动词的过去分词done +O.
2) 否定形式：S. have/has+ not+ 动词的过去分词done +O.
3) 疑问形式：Have/has+ S. + 动词的过去分词 done +O.
主要用法
1、过去发生并且已经完成的动作对现在造成的影响或导致的结果。这种状态下，already、just、never、ever、yet等副词常和谓语动词一起使用。如：
They have already come back from the museum.
She has already finished her homework.
2、过去发生的动作持续到现在，并可能持续下去。这种状态下，for和since作为标志性词语常和谓语动词一起使用，而且此时的谓语动词往往是持续性动词(如stay、keep、wait等)。如：
I have lived here for ten years.
He has kept the clavichord since thirty years ago.
3、从过去某一时间到说话时这段时间内反复发生的动作。这种状态下，表频度的副词(often、always、seldom、never等)和表次数的单词或短语(如once、twice、three times)常和谓语动词一起使用。如：
You have never listened to me like this before.
She has ever been to France.
They have visited the Summer Palace many times.
标志性词语
1、副词already、just、never、ever、yet等。如：
She hasn't arrived in Scotland yet.
They have just left for Shanghai.
2、for和since。for+一段时间，since+具体时间。如：
He has learned Italian for five months.
He has learned Italian since five months ago.
3、so far和up to/till now。表示“迄今为止”。如：
So far, no one has heard any news about her.
She has read fifty books up to now.
4、recently、lately等表示“最近;最新”的副词和形容词。如：
I've met her on several occasions recently.
He hasn't had enough sleep lately.
5、in the past/last+一段时间，表示“在过去的...时间里”。如：
In the past few years, new buildings have sprung up all over Beijing.
He had aged rapidly in the last few months.
6、次数。如：
I've tried many times, but there's no way.
He has been there at least twice.
句型转换
“have/has done”中的have/has是助动词，在进行句型转换中要注意不需要再另外借助助动词do/did/does，而是直接借用have/has。如：
肯定句：He has lived here for the last few years.
否定句：He hasn't lived here for the last few years.
一般疑问句：Has he lived here for the last few years?
划线提问：How long has he lived here? (划线部分为for the last few years)
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