如何用分词来简化状语从句
如何用分词来简化状语从句
在使用英语时,有一个规则:能使用短语时不用句子,能用单个词时不用短语。因此,有些从句在实际应用时,有些可以可以简化成短语。下面先讲讲义中出现过的时间状语、原因状语和条件状语的简化情况。 情形一:从句主语和主句主语一致
步骤:去(从句)连词—去(从句)主语—(从句)谓语变分词
时间状语从句
1、 以when ,while 引导的时间状语从句和以if 引导的条件状语从句,谓语动词是主动语态时,如果从句谓语动词所表示的动作是与主句谓语同时发生,可简化为现在分词的一般式;如果从句谓语动词所表示的动作发生在主句谓语之前,则可简化为现在分词的完成式。
When we heard (=When hearing/Hearing)the teacher's pleasant talk to us, we began to feel comfortable. While Mary was standing(While standing/Standing) in front of the teacher, she(Mary) was very nervous. 状语从句的谓语动词是被动语态时,可简化为过去分词。
When /If it is heated to a high temperature(=Heated to a high temperature),water will change into steam. If we are given(=Given) more time, we can do the work better.
If the city is seen(=Seen) from the mountain, it(the city) looks very beautiful.
2、以after,before 引导的状语从句可用after,before+从句谓语动词的动名词(短语)形式构成介词短语作状语。
After he put on (=After putting)the trousers, he found they were 2 inches too long.
也可:Having put on the trousers, …
Before we do the job(=Before doing the job), we'd better think it over.
3、以as soon as 引导的状语从句,可用On+谓语动词的动名词形式作状语,此时的动词是非延续性动词。 Doctor Bethune began to operate on the wounded soldiers as soon as he arrived (=On arriving)at the village.
2、原因状语从句
可简化为分词短语作状语。
Since you still look pretty sick(=Looking pretty sick), you'd better have a good rest.
Because he was(=Being) one of the best teachers in the city, he was given a medal.
Since I didn't know Chinese(=Not knowing Chinese), I tried to speak to her in English.
步骤:去连词—留主语—动词变分词
当状语从句的主语与主句的主语不一致时,状语从句简化成分词短语时则要保留其本身的主语,使该主语成为分词短语的逻辑主语,即构成独立主格结构(主语+分词)。例如:
As it was fine that day(=It being fine that day)),we decided to go fishing.
Since his father had fallen ill(His father having fallen ill),John had to begin working at the age of ten. If weather permits(=Weather permitting), we will have a picnic.