在英语六级众多语法点当中，省略句算一个较为重要的语法结构，也在历年考试中经常出现。通常来说，在以as, than, when, if, unless等引导的从句中的省略；在有些状语从句中,如果谓语包含有动词be，主语又和主句的主语一致a)，或者主语是it b)，就常常可以把从句中的主语和谓语的一部分(特别是动词be)省略掉。那么，英语六级省略句相关知识点该如何训练？今天，北外网课（北京外国语大学网络课堂）老师就整理了一些经典例句，供大家参考。
He said that no acrobat could ever perform those daring feats unlesstrained very young.
Once having made a promise, you should keep it.
If necessary I’ll have the letter duplicated.
Look out for cars when crossing the street.Fill in the applicationas instructed.
Whenever known, such facts should be reported.
The documents will be returned as soon as signed.
When taken according to the directions, the drug has no sideeffects.
While there he joined in voluntary labour on a project.
Although not yet six months old, she was able to walk withoutsupport.
Enemies, once discovered, were tightly encircled and completelywiped out.
She hurriedly left the room as though/if angry.
She worked extremely hard though still rather poor in health.
If not well managed, irrigation can be harmful.
Though reduced in numbers, they gained in fighting capacity.
This viewpoint, however understandable, is wrong.
Fill in the blanks with articles where(ver) necessary.
If possible, I should like to have two copies of it.
As scheduled, they met on January 20 at the Chinese Embassy.
在以than a) 或 as b) 引起的从句中,常会有一些成分省略.
We will, as always, stand on your side.
They worked with as much enthusiasm as young people (did).
He is now a vice-manager, but still often works in the kitchen asbefore.
He told me not to use more material than (it is) necessary.
We should think more of the collective than of ourselves.
Their training is free, as is all education.
His life is as fully committed to books as anyone I know.
While standing there in her nightgown, two bullets struck the wallbeside her.