非谓语动词与从句的转化简化PPT课件
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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。