havebeendoingsth有这个语法结构麼?wehavebeentalkihavebeendoingsth有这个语法结构麼?wehavebeentalkingatcrosspurposes..不懂哇不是beingdone...havebeendone

Question

have been doing sth 有这个语法结构麼?we have been talki
have been doing sth 有这个语法结构麼?we have been talking at cross purposes..不懂哇 不是being done ...have been done

Answer 1

1.有,这是完成进行时：
现在 过去
We have been doing sth…… We had been doing sth………
（其他人称不一一列举）
2.而 have been done 是被动完成时—— 用“have,has”为现在时,用“had”为过去时.
3.……being done 是用在被动进行时：（前面加相应的“verb to be”）
An elephant is being driven along the road. （现在时）
……a big power station was being built there. （过去时）
请复习一一下语法中的语态（主动、被动）和谓语动词的时态,这可是语法中的核心内容.