这里为什么用过去完成时?has been an in valid?has been +过分和has+过分有什么区别?

这里为什么用过去完成时?has been an in valid?has been +过分和has+过分有什么区别? it was said that his father___A.has died B.died C.has been dead D.had died为什么不能选B,而且表示两件过去的事情,不是要先 过去完成时+过去时?这里为什么是过去时+过去完成时? which 后面为什么还用has been 这个时态,我认为应该用过去完成时A new machine called 'The Revealer' has been invented and it has been used to detect gold which has been buried in the ground. 在看绝望主妇,有一句英语的语法明白,How long has it been since you’ve had sex?意思是你有多久没做爱了,但是这里为什么要用过去完成时呢? he studied the picture,which ___ in the summer timeA.has takenB.had been takenC.has been takenD.taken选择B.为什么用过去完成时啊 He has lived here since 1992.这里为什么用has lived而不用has been living? She has been waiting for you for two hours.这里为什么要用 has been ,特别是 has Thanks! 过去完成时问题Although the city ____ (destroy) during the war,it has now been completely rebuilt这里是用过去完成时还是一般过去时,感觉是后者因为现在完成时属于现在时范畴. she has been ill for 3 days,这里为什么要用been,直接she has ill 不行吗 虚拟语气 表示与过去的事实相反的愿望用过去完成时么 为什么用了have been fixed而不是had been fixedthis ATM has been out of service for a few days .it should ( have been fixed )last week Hurry up!The play ___ for ten minutes.选项见补充.A.has begunB.had begunC.had been onD.began为什么选C?为什么要用过去完成时? His wife,to whom he______ for 20 years,was childless.A.had married B.has married C.had been married这里为什么选C C 不是过去完成时的被动语态吗?可不可以具体解释下. 英语：Tom went to the box office at lunch time,but all the tickets bad been sold out为什么这里用的是过去完成时?而不是现在完成时 has 或have been 怎么用?它跟过去完成时是一样的吗 had been和havev been中为什么要加been?在现在完成时（have been）和过去完成时(had been)通常会有一个been出现,been是be 的过去分词,have和had是助动词,问：这里有助动词了为什么还要用been?这两种时态 He has been there for six months这里的has been是什么时态为什么不用gone呢,为什么要用been呢,我知道have been to 是表示去过哪里,但是这里没有to The land legally___the government has been taken by some people.为什么这里用belonging to The doctor and writer has been here for two years.为什么用has?说一下这里应用的语法好了...