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have been doing 和have done 还有had done三者的区别,用法
举几个例子,

2018-11-24 10:12:31热度:作者:admin来源:网络收集

have been doing 是现在完成进行时,表过去发生的动作一直在进行到现在.
We have reading an interesting book since last week.
have done 是现在完成时,表在过去发生的动作对现有影响.
So far I have been to Beijing twice.
had done 是过去完成时,表过去的过去.
When I got there he had gone.
我是从事英语的,不明再问啦.

话题:几个 用法 例子 

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