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

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 请解释一下这段英语句子的语法?plans for revolution that had long been incubating in their minds 上面这句句子,关于had been incubating这一段的语法? 英语关于since用法的一个问题!有一个句子是：Since the government was bankrupt,many of the soldiers who were sent to quell the riots had not been paid in months.为什么要用“had been”这个过去完成时而不用现在完成时 英语非谓语动词的用法看这两个句子为什么一个but后接动词原形,一个接to do?The departure time of the plane has been postpond.so we have mothing to do now but waitthat was so serious a matter that i had no chioce but to call i 关于英语定语从句的问题,He noticed a remains of a snake which had been dropped by a bird onto the wires.和 He noticed a remains of a snake which a bird had dropped onto the wires这两个句子有错误吗?一个是被动式一个是主动 英语,has been和 had been 一个关于英语时态的句子问题 作文里last week we had a monitor election.Ann won and she said she would do还是did agood work.还有这句话有毛病吗 总觉得最后不标准 请帮忙讲解一个英语句子It had been many years since they had lived there.我看翻译是“他们已经很多年没在这里居住了”希望各位亲们能给我讲一讲,关于语法、时态、结构、特殊用法一类的, 一下两个英语句子有什么区别呢?It had been a very strange morning.it was a strange morning表达那是一个奇怪的早上为什么不用哇塞而是用来had been 为什么不用was 而用had been 呢 As no pumas had been reported missing里面的had been能不能换成was呢?关于新概念3第一篇课文中的这个句子, 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? 求三种英语句子,每种五句,新概念1的水平,例句在下例句1：where do you think you are?例句2：but you had better not do it again.第三个用can't have been和must have been,may have been造 请问一个英语句子的句子成份After driving twenty miles,he suddenly realized that he had been driving in a wrong direction.这句中,逗号前边的不是一个分句,而是一个短语,driving是动名词,是这样的吗 1.在句子中什么时候使用副词?2.在英语中,什么时候用had been doing had done has been doing has done请分别举例, 1.在英语中,什么时候用had been doing 2.在句子中什么时候使用副词?had done has been doing has done 有关于英语句子的语法分析,句子一,But I really had no idea that what Jean has done that Russ should treat her like this.Jean worked just so much as she was told do.这个句子中共有两个that,第一个that 、第二个that中间夹 英语句子翻译had had neither, she had been quick to pounce on.1.had had neither, she had been quick to pounce on.2.What would the point have been?3.A life that could have very well been hers if things had worked out differently.4. Were you out i 求英语句子改正错误Only when I got there I realized how badly the house had been damaged.句子改正错误