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从句与非谓语之间的转换一、当从句的主语与主句的主语一致（定语从句的主语与先行词一致），如果从句中是：1）从句用be动词作谓语be + doing；省略be；(例10)be + done；省略be；(例4)be + 介词短语；省略be；(例2)be + 形容词/ 副词；be变为being；(例9)be + 名词；be变为being；(例1)2）如果从句中是其他行为动词作谓语是一般现在时或一般过去时就一律用doing的进行时化简；(例3)是完成时态或after引导的一般时态，用having done化简。
(例7和11)二、当状语从句的主语与主句的主语不一致时，也可按上面第一条中方法化简复合句。
化简后的短语前加上原从句中的主语即可（既是独立主格结构）。
(例5、6、8)1.When he was a young boy，he used to ask lots of questions. = Being a young boy, he used toask lots of questions.2.When he was in the classroom, he read his book aloud. = In the classroom, he read his bookaloud.3.They went to the teacher for help who taught them English. = They went to the teacherteaching them English for help.4.When the earth is seen from space, it looks like a huge water ball. = Seen from space, theearth looks like a huge water ball.5.When a guest comes to your room, you can say to him "Have a seat, please". = A guestcoming to your room, you can say to him "Have a seat, please".6.When his mother entered his room, he was playing the computer game. = His mother enteringhis room, he was playing the computer game.7.After the two policemen entered the room, they turned off the light and waited there silently.= Having entered the room, the two policemen turned off the light and waited there silently.8.Because there was no bus, I had to walk home. = There being no bus, I had to walk home.9.Since it is fine today, we should have an outing this afternoon. = It being fine today, weshould have an outing this afternoon.10.While you are crossing the street, you should be careful. = While crossing the street, youshould be careful.11.When you have finished your homework, you may go home= Having finished yourhomework, you may go home.化简：注意当时间状语从句或条件状语从句化简时可以将引导从句的连词带上，如(例10)。
非谓语动词和从句的转换----一.不定式（短语）与从句的关系1.不定式（短语）在句中作主语，其功能相当于一个主语从句，因此二者之间可以转换。
(1).To be able to help you is really an honor.(=That I’m able to help you)(2).He seemed to know the way.(=It seemed that he knew the way.)(3).Bush is said to have decided to attack North Korea.(= It is said that Bush has decided to attack North Korea.)2.不定式（短语）在句中作宾语或宾补，相当于一个宾语从句(1).We still don’t know when and where to build a school.(宾语)(=when and where we should build a school)(2).I advised him to go and see the doctor.(宾补)(=that he should go and see)(3).He thought it a great pity not to have invited her. .(宾语)(=That he hadn’t invited her.)3不定式（短语）在句中作表语.，相当于一个表语从句(1).My suggestion is for them to leave as soon as possible.(=that they should leave)(2).My chief purpose has been for them to get a good understanding.(=that they can get a good understanding)4.不定式（短语）在句中作定语.，相当于一个定语从句(1).The question will be discussed at the conference shortly to open in Beijing.(=that is shortly to open in Beijing)(2).All dead, I was the only one to grow up. (=that grew up)5.不定式（短语）在句中作目的．结果状语.，相当于一个目的．结果状语从句(１).He came to the area in order/so as to study the folk music there.(=in order/so that)(2).The lady was so excited as not to say a word.(=so excited that she couldn’t…)7.不定式（短语）在句中作原因状语.，相当于一个原因状语从句(１)I trembled to think of being punished by the boss.(=because I though of being punished by the boss)(2).We were disappointed to have lost the game.(=that we have lost the game)二．动名词（短语）与从句的关系1. 动名词（短语）在句中作主语，相当于一个主语从句(１).Your going away (=That you went away) made the professor angry.(2).Mary’s not being made monitor(=That Mary was not made monitor ) made us sad.被动的动名词在句中作主语时一般不能省(3).Being called a fool(=That he was called a fool) hurt Bob badly.2. 动名词（短语）在句中作宾语或宾补语，相当于一个宾语从句(1).I remember being taken to Beijing(=that I was taken to Beijing) when I was five.(2).He admitted having married Mary to a soldier(=that he had married Mary to a soldier).3.动名词（短语）在句中作表语.，相当于一个表语从句(1).My duty is serving the people heart and soul (that I’ll serve the people heart and soul).(2).The problem is his not having prepared his lessons for the exam(=that he hasn’t prepared his lessons for the exam)(3).The difficulty is Mary’s being caught between the two trees(=that Mary is caught between the two trees).4.介词＋动名词（短语），相当于一个从句(宾语从句或同位语从句 0(1）He was afraid of being scolded by his mistake.(=that he was…)(2).He was astonished at her knowing you.(=that she knew you)(3).We heard the news of our team having won.(=that our team had won)三．分词（短语）与从句的关系1.分词（短语）作定语，相当于一个定语从句(1）The hospital was an old building built in 1931(=that was built in 1931).(2).Do you know the girl standing over there(=who is standing over there)?(3).The man speaking to us the other day(= who spoke to us the other day) has gone to Japan.本节值得注意的问题：现在分词短语作定语时，所表示的动作不能先于谓语所表示的动作，也不可以表示将来。
非谓语动词与从句的相互转换一、如何把复合句改为简单句呢首先，分清主从复合句，先要取消从句，一般要把引导从句的连词去掉。
例如: When he was waiting for the bus, he saw a dog・—Waiting for the bus, he saw a dog・其次，如果从句的谓语动词是主动式，就要把谓语动词改为现在分词；如果从句的谓语动词是被动式就要把谓语动词改为过去分词；并且要注意时态的变化。
例如：1.After he had finished his homework . he went home・Having finished his homework, he went home・2・ Because I have promised to meet my friend at the airport, I can" t accept your invitation.Having promised to meet my friend at the airport, I can' t accept your invitation.(3・ As he was deeply moved by the story, he couldt keep back his tears・—Deeply moved by the story, he couldn" t keep back his tears・4・ As he was born into a tenant farmer family, he had only two years of schooling・f Born into a tenant farmer family, he had only two years of schooling・另外，还要注意在用分词短语作状语时，它逻辑上的主语必须与句子的主语一致。
