NO.1定义

句型转换是句子类别的转换，目的是测试学生使用各种句型的表达能力，以便在考试分数中获得高分。为此，学生必须对所学的句子结构和句型的变化明确概念，各种句型如何转换，正确运用，这有助于提高英语口语和书面表达能力。

2号简单句和复句之间的相互变化

很多复合句和简单句可以相互变化，因此意义上不会发生太大变化。在很多情况下，是把复合句的从属句变成一个短语。

主语节、剽窃、目的语节、定语节、副词节等在某些情况下可以这样转换。

主语节有时可以与短语交换，它可以是不定式或动名词短语。

(1)when and where we should hold the meeting is still to be discussed .

when and where to hold the meeting is still to be discussed .

(2)it worried her a great deal that her son would stay up so late。

her son ' s staying up so late worried her a great deal。

(3) What we had to do was to stand there，trying to catch the offender.

we had to stand there to catch the offender。

标语有时可以与短语交换，与它交换可以是不定式和动名词短语。

my idea is that we should do it right now。

my idea is to do it fight now。

在某些动词后面，宾语节可以与动名词短语或不定式家人交换。

(1)I regret that I had told you the secret。

I regret telling you the secret。

(2)they don ' t know whether they shall carry out the old plan or not .

they don ' t know whether to carry out the old plan or not。

有些定语可以与不定式短语、分词短语或介词短语互换。

(1)can those who are seated at the back of the classroom hearme？

can those seated at the back of the classroom hearme？

(2)what are the most important measures we should take？

what are the important measures to be taken？

(3)the young man who was in the possession of the firm was at a desk。

the young man in the possession of the firm was at a desk。

经常用状语从句和短语交换，经常用分词短语代替状语从句来表示时间、原因和条件。用表示目的、结果、原因的不定式短语代替状语从句。另外，介词短语可以表示时间、原因、条件、让步等副词

(1) Given more time，we could do the job much better.

(2)they started off early so that they could catch the first bus

they started off early so as to catch the first bus。

(3)I could swim when I was eight years old。

I could swim at the age of eight。

3号复句与并列句之间的转换

英语的并列文可以在一定条件下转换成包含条件、时间、结果、让步、原因等的复合文。相反，复合句也可以转换成并列句。

例如：

并列句往往被转换成复合句，其中一节被转换成从句，然后根据句子的意思加上相应的从属连接词。

(1) It's foggy today，so we can't see the distant hills.

Because it's foggy today，we can't see the distant hills.

(2) Study hard，and you will get good marks.

If you study hard，you will get good marks.

复合语句转换为并列语句，一节转换为一节，并需要添加适当的并列连接词或分号。

(1)though he has been told several times，he still can't understand it。

He has been told several times，but he still can't understand it。

(2) If you study hard，you will make great progress in your English studies .

study hard and you will make great progress in your English studies。

4号简单句和并列句之间的相互转换

简单的句子转换成并列文，经常把简单句子中的一句转换成并列文的一节。

(1) Tom is too young to go to school。

Tom is very young and he can ' t go to school。

(2)she got up very early to meet her parents at the station .

she wanted to meet her parents at the station，so she got up early.

并列句子转换成简单的句子，经常把子句中的一个变成短语，这个短语通常是介词短语、不定式短语、分词短语、with的复合结构或独立主格结构。

(1)they cancelled their trip to yellow mountain for it rained heavily。

they cancelled their trip to yellow mountain because of the heavy rain。

(2) His mother was ill，so he had to stay at home to look after her。

His mother being ill，he had to stay at home to look after her。

综上所述，简单的句子和复合句之间交换了介词短语、不定式短语、动名词短语和分词短语。复合句和并列句之间的交换：从句换句，从句换句，连接词辅助。简单句和并列句之间的交换：句变句、句变句。

这一章是语法知识点的最后一章，再次回顾以前发表的文章内容，并在以后总结阅读技巧和方法。