1．省略共同的主语或宾语。

　　Tom picked up a book on the floor and (Tom) handed it to his teacher.

　　汤姆在地板上捡起了一本书并把它交给了老师。

　　2．若主语不同，而谓语部分的系动词、助动词或情态动词相同，则省略后面的系动词、助动词或情态动词。

　　Jack must have been playing football and Mary (must have been) doing her homework.

　　杰克肯定一直在踢足球，玛丽肯定一直在做家庭作业。

　　3．若主语与谓语动词相同，则省略后面的主谓成分。

　　His advice made me happy, but (his advice made) Jim angry.

　　他的建议使我高兴，却使吉姆生气。

　　4．若主语不同，但主要动词及后续部分相同，则省略主要动词及后续部分。

　　He has a knowledge of first aid but his friend doesn't (have a knowledge of first aid)．

　　他具备急救知识，但他朋友不具备。

　　[即时演练2]　写出下列句中可以省略的部分

　　①Some of us study Japanese, and others study English.others后的study

　　②He gave up drinking several months, but he returned to his old way later.he

　　③My friend didn't come to school, but I wonder why he/she didn't come to school.he/she_didn't_come_to_school

　　三、复合句中的省略

　　1．状语从句的省略

　　(1)在when, while, if, as if, though, although, as, until, once, whether, unless, whenever等连接的状语从句中，当从句主语跟主句的主语相同且从句谓语中含有系动词be或从句的主语为it时，则从句中主语和be动词常被省略。

　　Wood gives off much smoke while (it is) burning.

　　木头燃烧时产生很多烟。

　　Whenever (it is) possible, they would stop him and ask him the three questions.

　　只要有可能，他们就让他停下并问他这三个问题。

　　Will you be free this Sunday? If (it is) so, let's go camping.

　　这个周日你有空吗？如果有，我们去野营吧。

　　[名师点津]　省略句中的谓语动词和主语之间构成主动关系，则使用现在分词；若构成被动关系，则使用过去分词；若谓语动词表示的动作尚未发生，则使用不定式。

　　When (it is) heated, ice can be turned into water.

　　加热的时候冰可以变成水。

(2)在than, as等引导的比较状语从句中常省略某些成分。