新概念2第21课Over a hundred people must have been driven away fro

来源：学生作业帮编辑：搜狗做题网作业帮分类：英语作业时间：2024/07/16 05:18:15

新概念2第21课
Over a hundred people must have been driven away from their homes by the noise.这里为什么用homes?home不是不可数的吗?
还有,现在完成时和过去完成时有什么区别?它们分别怎么用?

1.本句中的must have been driven away是一种判断,表示最多去的事情的猜测,在新概念一册就出现过很多这样的句子.home可以作为可数名词,用复数表示“多个家庭”.
2.现在完成时表示过去的事情与现在的关系,对现在造成影响或延续到现在,于现在有着直接关系.过去完成时是过去的过去,是指在过去的某个时间以前已经完成了的事情.现在完成时基本结构是have（has）+p.p.,过去完成时的额基本结构是：had+p.p.

Over a hundred people must have been driven away._______they Over a hundred people must have been driven away.____they we Over a hundred people must have been driven away.( )they wer 英语语法Over a hundred people must have been driven away from th 5 Over a hundred people must have been driven away.______ th over a hundred people must have been driven away frome their over a hundred people must have been driven away from their 英语翻译Over a hundred people must have been driven away from th Over a hundreds people must have been driven away from their 还问个英语语法问题新概念英语2册的水平有这样一句话Over a hundred people must have bee there must have been several hundred people present.____ there must have been several hundred people present just bef