这个句子为什么要用过去完成时?Work on it had begun before my sisiter left.

这个句子为什么要用过去完成时?Work on it had begun before my sisiter left. 关于过去完成时的句子He had completely ignored her remark ,preferring his own theory .这里为什么要用过去完成时啊 下面这个句子中为什么要用过去完成时,有什么规律吗?Not until he had accomplished his mission did he realize that he was seriously ill. 什么时候用过去完成时我要知道句子中出现什么单词或词组时用过去完成时 英语翻译要用到until和过去完成时这个句子要用到过去完成时我们老师说的请回答者自行修改 (Have you got enough time left) to revise my work beafore i send it in?括号中的内容正确吗?如果正确,为什么要用过去完成时. thanks to the hard work of the rescue team ,the 13workerd who had been trapped in the mine were saved 这句话为什么要用过去完成时啊 下面句子为什么用的是被动语态was finished而不是过去完成时had been finishedWe are happy to learn that the difficult work was finished through everyone's effort yesterday. work的过去完成时 yesterday能跟过去完成时吗?如果句中有today,要用一般过去式或过去完成时填充句子,应用哪个时态? it was the first time 后面为什么要用过去完成时 I had known her long before. 为什么要用过去完成时? 用过去完成时造几个简单的句子. 用过去完成时造几个简单的句子 这个句子为什么使用过去完成时?I was wondering if you'd ever thought of starting a business. they can do well work与they can do the work well是不是同一个意思?那在句子中well work里的well指的是什么意思?为什么要用well而不是别的同义词呢?they can do well work是一本练习书里的句子当时这个句 He rent a house (by) the year.为什么括号内填介词by.“By+时间”的句子中不是要用过去完成时时态吗 It's fine work.what do you make of it?picoso's?请翻译一下这个句子,还有为什么用work?work翻译成著作时不是可数名词吗?不是应该用works 或a work吗?