重点句型
1. He and a colleague were to spend two years there teaching English at a teacher training college.
他和一位同事要在一所教师培训学院教两年英语。
2. Nearly 100 million people live here, most of them in the east.
差不多一亿人口住在此地,绝大多数在东部。

句型探究
1. He and a colleague were to spend two years there teaching English at a teacher training college.
他和一位同事要在一所教师培训学院教两年英语。
be to do 常表示以下意义：
① 表示按计划或安排要做某事；
② 表示“应该”,相当于should, ought to；
③ 表示“命令，要求”；
④ 表示“想，打算”；
⑤ 表示“注定，不可避免”做某事。
⑥ 在否定句中表“禁止”。
The plane is to take off at 2:30.
这架飞机将在2:30 起飞。
The books you borrowed are to be returned before May 7.
你借的图书应在5月7日前归还。
The letter is to be typed as soon as possible.
这封信必须尽快打印出来。
If you are to be there on time, you must go now.
如果你打算按时赶到那儿，你必须现在就走。
You are to be regretful for what you have done.
你会对你所做的事后悔的。
You are not to make any noise in the reading room.
在阅览室里，你们不得大声喧哗。
be to do sth., be about to do sth.都表示将要发生的动作。

①be to do sth. 表示的动作可能“即将”发生，也可能在将来发生,常与表示将来的时间状语连用。
②be about to do sth. 只表示“马上、就要”发生的动作或事情,不与表示将来的时间状语连用。
He is to come here tomorrow.
他明天将要来。
We were about to leave when it began to rain.
我们正要动身,这时天下起了雨。
2. Nearly 100 million people live here, most of them in the east.
差不多一亿人口住在此地，绝大多数在东部。
most of them in the east 为独立主格结构,独立主格结构是由名词/代词+ 非谓语动词/形容词/介词/副词构成的一个独立成分，该结构不是句子，也不是从句,常用逗号与其主语隔开，在句子中作状语，表条件、原因、时间、方式、伴随等。
There being no rain for a long time, the crops are drying.
长时间没下雨了，庄稼都要干枯了。
Everything done, he felt relaxed.
一切都做完了，他感到很轻松。
Weather permitting, we'll go to climb the mountain tomorrow.
天气允许的话,明天我们就去爬山。