什么是简单句?复合句变简单句怎样变?

什么是简单句?复合句变简单句怎样变?
是不是就是把那个复合句拆成两个句子?

http://baike.baidu.com/view/238672.htm?fr=ala0复合句变简单句是英语句型转换的一种重要形式,也是我们运用英语所应掌握的技能.现对转换形式作一解题指导.规则一：将宾语从句变为简单句1.用不定式改写.将宾语从句中谓语动词变为不定式.主句谓语一般是既可接不定式,也可接that从句的动词,如hope,agree,decide等.若宾语从句由连接代（副）词引导时,要变为“疑问词＋不定式”.如：We all agreed that we should leave at once．→ We all agreed to leave at once．The foreigners want to know how they can learn to do Chinese Kongfu well. → The foreigners want to know how to learn to do Chinese Kongfu well.2.用复合宾语,即"主语+谓语+宾语+宾补"这种结构语改写.如： I saw he went into that house just now ．→ I saw him go into that house just now． I heard she was singing in English．→ I heard her singing in English．3.用名词或名词短语改写.如：Do you understand what I said?→ Do you understand my words?规则二：将状语从句变为简单句1. so．．．that引导的结果状语从句常与too．．．to或enough to结构转换.当that从句为肯定句时,用enough to改写；当that从句为否定句时,与too．．．to结构转换,与enough to转换时,形容词或副词应变为与之相反的词,前面动词用否定结构.如：The box is so light that he can carry it．→ The box is light enough for him to carry．He is so young that he can't join the army．→ He is too young to join the army． →He isn't old enough to join the army．提示：so．．．that结构中如果主句与从句主语不一致时,变为too．．．to,enough to结构时,须在不定式前加for sb．作为不定式的逻辑主语.2. if条件状语从句与“祈使句,and（or）+简单句.”的转换."if引导的否定的条件句+主句"的句型可转换为"祈使句+or+简单句"；"if引导的肯定的条件句+主句"的句型可转换为"祈使句+and+简单句".如：Be brave, or you'll lose your chance. → If you aren't brave, you'll lose your chance.Use your head, and you’ll find a way. →If you use your head, you’ll find a way..3.because引导的原因状语从句与because of的转换.如：He was late for school because it rained heavily. →He was late for school because of the heavy rain.4. 把if not引导的条件状语从句转化为without短语.如：I can’t pass the exam if you don’t help me. →I can’t pass the exam without your help.5. 把时间状语从句转化为一个介词短语.如：I could swim when I was eight years old. →I could swim at the age of eight.6. 把so that 引导的目的状语从句转化为（in order） to do sth.如：She got up early so that she could catch the early bus. →She got up early to catch the early bus.规则三：将定语从句变为简单句1. 当定语从句是主动语态并且用的是进行时态时,可将定语从句改为现在分词短语；当定语从句中的谓语动词是表示经常性的动作时,可将定语从句改为现在分词短语.如：The man who is talking with Mary is my brother. →The man talking with Mary is my brother.A chemist’s shop is a shop which sells medicine. →A chemist’s shop is a shop selling medicine.2. 当定语从句是被动语态时,可将定语从句改为过去分词短语；当定语从句是表示将要发生的动作或具体某种情态意义时,可将定语从句变为不定式短语.如：This is a book which was written by a worker.→This is a book written by a worker.There is a lot of homework that we should do. →There is a lot of homework for us to do.3. 当定语从句中含有介词短语或形容词短语做表语时,可将定语从句改为介词短语.如：The girl who is in a hat is Lucy King. →The girl in a hat is Lucy King.