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be to do结构
1. should
2. must
3. intend
Such a private thing should be avoided.
Such a private thing is to be avoided.
No students must leave school without the permission of the police.没有警察的允许，谁都不准离开。
No students are to leave school without the permission of the police.
We intend to start a work next week.
We are to start a work next week.
be grateful to sb. for sth.
that went on=that happened
as he pleased 随他的意愿做
four more=another four
fiercely=strongly
at this 听到
At the words, he got angry.听到这话，他生气了。
With the words, he left the room angrily.说完这话，他生气地离开了房间。
pointed out ironically 讥讽地指出
hardly be necessary 大可不必
under与名词搭配表示一种被动的概念
under discussion/arrest/repair
make a telephone call 打一个电话
only引导的时间状语从句或介词短语，以及条件状语从句在句首时，句子要倒装。