had been只是is的过去完成时么?怎么把 It had been a good day 改成疑问句?have been to 是不是固定搭I have been to the US.意思是我去过美国.这句话是现在完成时态,可是改成一般现在时就变成了 I is to the US

had been只是is的过去完成时么?怎么把 It had been a good day 改成疑问句?have been to 是不是固定搭 had been只是is的过去完成时么?怎么把 It had been a good day 改成疑问句?have been to 是不是固定搭I have been to the US.意思是我去过美国.这句话是现在完成时态,可是改成一般现在时就变成了 I is to the US It had been many years since my wife and I had gone dancing it + 过去完成时 + since + 例句：it + 过去完成时 + since + 过去完成时为什么不是it + 过去完成时 + since + 过去式?真的是it + 过去完成时 + since + 过去 请问下过去完成时的用法have you been there?yes ,i have just been there.i had never been there before.请问i have just been there.为什么这句不能用过去完成时而后句又为什么要用过去完成时? 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 if it had not been for ..句型对吗if it had not been for your timely assistance in giving me first aid,I fear that the consequences might have been much serious.这句话的开头：if it had not been for...,是if it is not 的过去完成时? was和had been是什么关系 过去完成时吗? 一个选择题过去式和过去完成时的区别His Selected Poems ( was ) first published in 1992.括号中可以换成had been吗突然想起来了，过去完成时，是需要有过去的过去的时间提示。而这句话，只是说1992， my tongue was busy searching out the hole where the tooth had been,最后的had been是什么用法为什么要用过去完成时,省略的什么, my husbnad and i had been married 30 years. 如何理解用过去完成时的被动时态.过去完成时不是指过去的过去吗.但这里感觉不到吖 he had been very ill before he died.和he was very ill before he had been died.两个句子是关于过去完成时的,那个对? had been则是过去的过去,是过去完成时,怎么理解“过去的过去”的意思最好举例说明 过去完成时有和be动词一起的句子吗?请举例He had been a doctor for threee years 我见的好像是It is +一段时间 +since从句（一般过去时）It was/had been +一段时间+since从句（过去完成时） 好像since从句的时态并不一样对于从句时态,是不是按照主句谓语动词变化? 一个英语句子,关于had been donethree executives who had been briefed on the plans but spoke on the condition of anonymity because they were not authorized to discuss the matter.这句话中 had been briefed 是过去完成时的被动语态么 现在完成时的过去式和过去完成时怎么区分比如I had never been on a plane before.是不是没有提到过去具体某时以前就是过去完成时是不是没有提到过去具体某时以前就不是过去完成时 句子中的has been ,have been,had been 代表什么?完成时,和过去完成时吗?可以翻译成什么?“jeff is a boy,for the past three years,has been a good fried of mine. had looked这类短语是过去完成时么?