为什么has/have been.后面的动词要是ing形式?

为什么has/have been.后面的动词要是ing形式? 现在完成时have/has为什么后面有时加动词的过去分词,有时加been have/has been 后面跟什么词? have been 和 has been的区别 has been have been的区别 there have been many great inventions 为什么用have一个地点不应该用has吗 难道是要跟后面的inventions?不太懂 现在完成时have been的意思我说的have been 是现在完成时的,为什么have been有时后面是动词,有时后面是形容词,还有,是什么条件引发的have been,现在完成时构成不是have/has吗? 英语小白 请见谅 have/has been后面能跟动词的什么时态?请举例说明. have ever 为什么后面加been have been / has been / had been 的区别 have been in have gone toHe__________New York for a week.has been in 还是 has gone to 后面有接for a week..感觉是 has been in...不过还是来问一下为什么. The examiner must have been pleased with my performance,for he...为什么must后面不是had或者has呢 i have been felling better since the doctor came 时态的用法为什么后面是 the doctor came 而不是 the doctor has came还是两个都可以还有为什么前面用 been felling has been doing 的用法看到一句话：it has been a favorite magazine sinc i was a child.has been 后面接了名词,这是属于什么时态的用法呢?是have been doing She must have been tricked 是否确的说法吗?用have还是用has 为什么? There have been great changes in our country since 1990...有几个疑问：为什么 There 后面是 have 而不是has 还有为什么是great changes 而不是单数?我要的是为什么. where _ he he_to the library.A have been,went B have been ,have been C has been,went继续上面的“D has been,has been there has/have been的用法