苏黎世联邦理工费用:this hat has been in the window for a long time

来源：百度文库 编辑：查人人中国名人网 时间：2024/04/29 08:40:51
这里的has been 句型不懂 请大家帮忙解释一下 用法和在句子里的意思

这个帽子在窗户上已经有一段时间了.
has been 是现在完成时,表示这个动作对现在仍然后影响.也就是说,帽子现在还是在窗户上.
如果我们用had been也就是过去完成时时态的话,意思就不同了.表示的是,帽子曾经在窗户上放了一段时间,但是现在已经不在窗户上了.

现在完成时,表示一种状态."已经"的意思
如:
She has been in China for a long time.
"她已经在中国待了很久了"

这个句子是过去完成时态
过去完成进行时表示动作在过去某一时间之前开始，一直延续到这一过去时间。

和过去完成时一样，过去完成进行时也必须以一过去时间为前提。

I had been looking for it for days before I found it.

这东西我找了好多天才找着的。

They had only been waiting for the bus a few moments when it came.

他们只等了一会儿车就来了。

这个帽子在窗户上已很长时间了.
HAS BEEN是完成时
这时没有实际意思,是表未时态的词

完成时．．．

this hat has been in the window for a long time this file has been damage This account has been suspended. This program has been damaged This account has been suspended.) this account has been suspended This Account Has Been Suspended这是什么意思 This Account Has Been Suspended中文是什么意识 This program has been damaged……是什么意思？ The bandwidth limit for this site has been exceeded