一些英语问题
1，使役动词和情态动词是否无过去分词亦无被动语态？ 2，祈使句有被动语态吗？ 3，请将下句转换为被动语态（不可转请说明） Please don't make your classroom dirty 4,请问下面的同义转换有没有错误,有错误的请帮忙改正或给出正确答案 (1)The old man has no sons or daughters The old man has neither sons nor daughters ------------------------------------------------ 5,Our teachers are visiting USA these days USA are visited by our teacher these days ------------------------------------------- （这句可以改成被动语态吗？） 6，We passed English exam with the teacher's help With the help of the teacher ,we passed the ----------------------------------------------- English exam(这是什么句型／什么用法） ------------ The teacher help me passed the English exam --------------------------------------------- (这样改可以吗？） 以上两种改法哪种更好？ ７，when 有时表示突然，while后可接持续的动作啊。 1.非延续性动词： 表示动作很短暂，不能持续； 如：come;go;begin;turn;buy;put on; 2.延续性动词：表示动作可以持续； 如：sleep;wear;be dressed; be seated; 请就when +非延续性动词&while+延续性动词举例 请问这是不是指针对或者仅常使用与状语从句里？
我来帮你吧！ 1，情态动词无无过去分词亦无被动语态 使役动词也并不是所有的都有！这一个有！如： I made my students finish the homework。=My students were made to finish the homework by me。
2,没有 3，不可以！ 4，正确 5， 被动语态应该是 USA is visited by our teachers these days 6,with the help of sb =with sb's help The teacher help me passed the English exam有错误！ 应该是The teacher helped me pass the English exam help sb do sth 而且整句是过去时 7，while 和when引导时间状语从句的区别我举例吧 when my father came home,I was doing cooking。
(回家是短暂性的动作) while the baby was sleeping,the mother was doing the housework。 (while引导的从句部分可以用进行时态)。
上网来去匆匆,你写这么多,确实难得有时间仔细看呀.
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