简化句在阅读的时候倒很容易理解，但是写作就没那么容易了。为了能写一手流畅简洁的作文，简化句的规则还是要研究透彻的。从句的简化通则为：

不论是名词类、形容词类还是副词类的从属从句，简化的共同原则是省略主语与be动词，只保留补语部分。（旋元佑《文法俱乐部》）

例如：

It is common courtesy that one should wear black while one attends a funeral. It is common courtesy to wear black while attending a funeral. Whether it is insured or not, your house, which is a wooden building, needs a fire alarm.

> Whether insured or not , your house, a wooden building , needs a fire alarm. 省略重复或无意义的主语（one）很容易理解，那么省略be动词呢，毕竟不是所有的句子都有be动词，这时候分两种情况： 1.有助动词的变成不定词。 2.没有助动词的变成Vin。 这个很容易理解，分为几种情况分析：

形容词从句简化：

The manyou asked about is here. Beer chilled to 6°C is most delicious.

形容词从句需要简化重复部分，第一句中从句宾语被简化，第二部分被动态的主语和be动词被简化。

Your brother John, wounded in war , will soon be sent home.

这句里your brother John是专有名词，因此后面的关系从句只有“补充说明”的作用而没有“指明是谁” 的作用，因此应该放在“，”中

My old car, breaking down every other week , won't last much longer.

这句同样是省略主语和be动词，因为是主动态，所以剩下了Ving

John is the one who should go this time John is the one to go this time. John is not a man to trust. John is not a man to be trusted.

有助动词的省略会剩下to do，但会涉及几个问题，主被动，如第三句是whom one can trust的省略，第四句是whom can be trusted的省略。

This is exactly the thing to do. This is exactly the time to do it.

及物动词不定词有无宾语，第一句是the thing which we should do的省略，由于对方知道是在说谁，因此we也省略了。第二句是the time when we should do it的省略，因此保留了it。

I have a job your brother can do. I have a job for your brother to do.

这句中省略主语会造成语义含混不清，因此加了个for+从句主语来避免，最常用的是for，也可以更改。

Hilary Clinton, pretty and intelligent , is a popular First Lady. Bill Clinton, President of the U.S., is a Baby Boomer.

以上为简化时补语为形容词以及名词的情况。