一．用“ 及物动词+ 不定式” 结构可以将含有 that 引导的某些宾语从句的复合句转换成简单句例如： 1. He decided that he would buy a digital camera online. →He decided to buy a digital camera online. 2. We hoped that we would come back soon. →We hoped to come back soon. 3. I expect that I shall finish my work by this Sunday. →I expect to finish my work by this Sunday. 二．用“ 疑问词+ 不定式“ 结构可以将某些含有连接代词或连接副词引导的宾语从句转换简单句例如： 1. I don’t know which one I can buy . →I don’t know which one to buy. 2. We wonder where we’ll go this Sunday. →We wonder where to go this Sunday. 3. Could you please teach me how I can search the Internet? →Could you please teach me how to search the Internet? 三．用“too…to…” 结构可以将含有 so…that 引导的结果语从句( 否定)的复合句转成简单句。
如： 1. The boy is so young that he can’t look after himself. →The boy is too young to look after himself. 2. The question is so difficult that I can’t answer it . →The question is too difficult for me to answer. 四．用“…enough + 不定式” 结构可以将含有 so …that …引导的结果状语从句（肯定）的复合句转变为简单句例如： 1. The girl is so tall that she can reach the apples on the tree. →The girl is tall enough to reach the apples on the tree. 2. This hall is so large that it can hold 2000 people. →This hall is large enough to hold 2000 people. 3. The table was so light that the little boy can carry it. →The table was light enough for the little boy to carry. 五．用“happen + 不定式” 或“seem +不定式” 结构可以分别将“It happens that…”和“It seems that… ”等含有主语从 句的复合句转换为简单句。
例如： 1. It happened that the teacher saw him playing in class. →The teacher happened to see him playing in class. 2. It seemed that sharks have been on the earth for thousands of years . →Sharks seemed to have been on the earth for thousands of years. 3. It seemed that this camera offered the most at the best price. →This camera seemed to offer the most at the best price. 六．用“in order +不定式” 或“so as +不定式”结构可以将含有 so that 引导的目的状语从句的复合句转换为简单句如： 1. She decided to buy a camera online so that she could receive it soon. →She decided to buy a camera online in order to receive it soon. →She decided to buy a camera online so as to receive it soon. 2. I went over my composition again and again so that I couldn’t make any mistakes. →I went over my composition again and again in order not to make any mistakes. →I went over my composition again and again so as not to make any mistakes. 3. Miyoko bought a camera so that she could take pictures in Beijing.→Miyoko bought a camera in order to take pictures in Beijing. →Miyoko bought a camera so as to take pictures in Beijing. 七．在某些作表语的形容词后面加不定式可以将某些含有状语从句的复合句转变成简单句。
例如： 1. I was glad when I heard the good news . →I was glad to hear the good news. 2. Tom’s parents were very surprised as they knew all about it. →Tom’s parents were very surprised to know all about it. 八祈使句+or+简单句“ 可转换为“if 引导的否定的条件句+主句“ 的句型；“祈使句+and+ 简单句“ 可转换为“if 引导的肯 定的条件句+主句“的句型例如：1. Be brave, or you'll lose your chance. → If you aren't brave, you'll lose your chance.2. Come on, or we'll miss the early bus. → If we don't hurry, we'll miss the early bus. 九 定语从句的主从句缩略为简单句 为了使表达言简意赅，英语中常用一定的语法手段把句子简缩。
定语从句简缩成单词或短语就是其中常见的一种现象 1．在主动式定语从句中，如关系代词作从句的主语，谓语是一个行为动词，这时从句常缩略为一个现在分词短语 如： ① The man who is walking along the street comes from our company.→ The man walking along the street comes from our company.②This lens produces rays which converge towards a point. → This lens produces rays converging towards a point.如果从句的谓语动词后没有作状语的介词短语，由该动词变成的现在分词常置于所修饰的词之前如： ① This lens produces rays which converge . → This lens produces converging rays.②The countries which are developing should get united. → The developing countries should get united. 把定语从句简缩为现在分词短语有以下几种情况： （1 ）从句的谓语和主句的谓语所表达的时间要一致。
如： We used to live in the house which faced south. → We used to live in the house facing south.（2 ）从句的谓语动词是进行时态如： Come tomorrow and show your visa to the man who will be sitting at that desk. → Come tomorrow and show your visa to the man sitting at that desk.（3 ）从句和主句的谓语所表达的时间都是泛指如： China is a developing socialist country which belongs to the third world. → China is a developing socialist country belonging to the third world.（4 ）从句谓语动词的动作一发生，主句谓语动词的动作紧接着发生如： The man who stole into the room was caught immediately on the spot. → The man stealing the room was caught immediately on the spot. （5 ）从句谓语动词的动作可发生在主句谓语动词的动作这前。
如： Can you catch the bus which will leave at 8 this morning? → Can you catch the bus leaving at 8 this morning?2 ．在定语从句中，如从句的谓语动词是系动词 be 的一般现在时或一般过去时，表语是介词短语、形容词短语或名 词短语，该从句可以缩略成介词短语、形容词短语或名词短语，作后置定语如： ① We saw the glasses that were on the table fall off onto the floor. →We saw the glasses on the table fall off onto the floor.② China is country which is rich in resources. → China is country rich in resources.③ They had to fetch water from a well which was a mile away from the village. → They had to fetch water from a well a mile away from the village.如果定语从句仅有一个案形容词作表语，从句简缩后，该形容词的位置由其性质而定：若是表语形容词，应放在所 修饰的词之后。
如： All those who are present 。