非谓语动词与从句的转化简化PPT课件

从句与非谓语动词之间的转换非谓语动词和从句可以相互转换，那么如何将复合句改为简单句呢？首先，需要分清主从复合句，然后取消从句，一般要把引导从句的连词去掉。

例如，将"When he was waiting for the bus。

he saw a dog"改为"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，将"After he had finished his homework。

he went home"改为"Having finished his homework。

he went home"。

另外，使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。

如果主从句的主语不一致，在取消掉从句变为-ing或-ed形式时，要把从句的主语保留，其它部分和以前的改法一样。

例如，将"As it was hot。

we went swimming"改为"It being hot。

we went swimming"。

需要注意的是，在使用分词短语作状语时，它也可以有自己独立的逻辑上的主语，这种结构称为独立主格结构。

在很多情况下，它都表示一种伴随的动作或表示一种原因。

例如：1.If the weather allows。

I will go there.2.After the rain ped。

XXX.3.His XXX。

and he prepared to return to his institute.4.With so many comrades absent。

XXX.From the above examples。

we can see that the present participle (-ing) usually indicates an n that is happening at the same time as the main verb in the sentence。

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when and where to build a school.(宾语)(1).We still don’t know(=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 could n’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 bythe 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 betweenthe 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。