不是的,我给你转一个相关的回答吧：
在句首的only如果后面跟了副词、介词短语或从句等状语,则主句用倒装结构.如only后跟
的是主语,就不用倒装结构了.例如：
Only when the war was over in 1918 was he able to get back to work．
Only in this way can you learn English well．
Only after a bitter struggle was the aim achieved．
Only the teachers are allowed to use the room．（不倒装）
Only five men were hurt in the accident．（不倒装）
注意,only和所修饰的状语如果不在句首,则不倒装.
如：
The boy was helped out only when his father arrived in a hurry．
Only then did he realize the importance of English