每日学习一点英语知识：倒装句（only篇）

测一测

Only in this way ______ English well.

A. we can learn

B. can we learn

C. learn we can

知识点解析

今天，我们来学习only放句首表强调引起的倒装。


· 如何倒装

1.谓语动词是be动词
You are only allowed to go out to play after you finish your homework.
倒装：Only after you finish your homework are you allowed to go out to play.
结论：1）only+被强调部分提到句首
2）将be动词提到主语前面

2.谓语动词是have / has / had或情态动词
You can only play after lunch.
倒装：Only after lunch can you play.

You have only known the mysteries of life then.
倒装：Only then have you known the mysteries of life.

结论：1）only+被强调部分提到句首
2）将have / has / had或情态动词提到主语前面

3.谓语动词是实义动词
They only discovered his secret then.
倒装：Only then did they discover his secret.

结论：1）only+被强调部分提到句首
2）将隐藏的助动词do / does / did提到主语前面
3）实义动词变为原型


· 什么是被强调部分
被强调部分是状语，一般有三种情况

1） only+副词
常见：only then
Only then did we realize that we were wrong.

2） only+介词短语
常见：after引导的短语, in this way等等
Only in this way does this machine work.

3） only+从句
常见：if引导的从句，when引导的从句等等
Only if everybody agreed would I accept this position.
Only when he needed some help did he call me.

其实，总结一下，only要倒装，有两个条件：
1. 放在句首
2. 修饰状语

小练习

Only after the accident ______ cautious.

A. did he become

B. he became

C. did he became

Only then ______ all safe.

A. we are

B. is we

C. are we

Only when one falls ill ______ the value of health.

A. does one know

B. one knows

C. knows one

考试真题

真题来啦！

Only if you eat the correct food will you be able to keep fit and stay healthy.(江苏高考)

Only if the jobless arrive at the job-center with a CV register for online job search, and start looking for work will they be eligible for benefit-and then they should report weekly rather than fortnightly.（2014年 考研英语）