Simple to learn, easy to forget!
======================语法常识回顾=================
1、情态动词组成被动式很简单：情态动词+be+过去分词。我们可以用shall be, will be, should, ought to be, can be, must be + 过去分词。
2、特别要指出的就是 must have been, must be 这两种表达法，既可以用作被动式，又不是被动式。
(A)被动式：
He must have been arrested by the police. 他谅必被警察逮捕了。（指过去）
He must be a teacher. 他说不定是个教师。（指目前）
3、本课有一种在字面上看不出是被动式却有被动内涵的表达，另有一种字面上是被动式却不是被动的表达，这方面头脑里必须要十分清楚。
1）···however, it came into use.
come into use 是开始使用的意思，句子中看不出有“被”。
例：The new machine will come into use next week. 新机器将在下周开始被使用。
2）···I am determined to stay here.
be determined to. 看来似被动式其实不是，这个 be 后面的 determined 是作形容词用的，表示“决心”。
例：I was determined not to follow their advice. 我决定不听他们的建议。
《 Mad or Not / 疯了还是没有疯》
Airplanes are slowly driving me mad. I live near an airport
and passing planes can be heard night
and day. The airport was built during the war, but for some reason it could not be used then. Last year, however, it came into use.
{ 飞机在慢慢地驱使我发疯了。我住在机场附近，日夜都能听到过往的飞机声。机场是在战争期间建造的但是由于某种原因，那时不能被使用。然而去年机场开始被使用了。}
Over a hundred people must have been driven away from their homes by the noise. I am one of the few people left. Sometimes I
think this house will be knocked down by a passing plane.
{有一百多人谅必被噪音从家里赶跑了。我是留下来的仅有几个人当中的一个。有时候我想这所房子会被一架过往的飞机撞倒的。}
I have been of fered a large sum of money to go away, but I am determined to stay here. Everybody says I must be mad and they are probably right.
{已经有人向我提供了一大笔搬家费，但是我决心呆在这里。大家说我说不定疯了，也许他们是对的。}
词 汇 注 解
drive sb mad 驱使人发疯
night and day 日夜
for some reason 由于某种原因
come into use 开始被使用
must have 谅必
knock down 撞倒
a large sum of 一大笔
be determined to 决定
must be 说不定，恐怕是
