only倒装用法
一 、“only+副词”位于句首：
1、Only then did I realize that I was wrong.
只是到了那时我才意识到是我错了。
2、Only by shouting was he able to make himself heard.
他只有叫喊才能让别人听到他。
二、“only+介词短语”位于句首：
1、Only by working hard can you succeed.
只有努力工作你才能成功。
2、Only in the reading-room can you find him.
你只有在阅览室才能找到他。
三、“only+状语从句”位于句首：
Only after she died was I able to appreciate her.
只有到她死后我才认识到她的价值。
四、注意：若位于句首的不是only+状语，而是 only+宾语等，则通常无需倒装(但有时也可以倒装)：
Only a policeman the children saw in the street.
