每天英语知识点，普及英语小知识。
hello，大家好，我是知识君。
上期练习题答案为：B C A
上期咱们讲了so that倒装句，今天要和大家分享的是英语中only倒装句的正确用法！
课前小测试
Only in this way ______ English well.
A we can learn
B can we learn
C learn we can
（答案见文末）
知识点解读
今天，让我们一起来学习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和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
好了，英语中only倒装句的正确用法，大家都掌握了吗?
下面我们来做题练习一下吧！
练习题
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
课前小测试：B
练习题答案：下期文章公布！
如果本文对您有所帮助，欢迎分享转发，和大家一起学习。
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