notonlybutalso的倒装用法一定要放在句首吗

Not only在句首，（其实，是否定词放在句首，) 这个句子才倒装。Notonly do Ilikethis movie, butmymotherlikesitas well.从句是不倒装的。但例外的是：虚拟条件句可以倒装。（这个不是初中学的了）简单的例句：If he were here, we would be happy.=Were he here, we would be happy.