“not only...but also...”是一个常用的并列结构，用于强调两者都具备某种性质或情况。在倒装用法中，为了保持句子的平衡和强调的效果，通常会将助动词、系动词或情态动词提到主语之前。以下是一些关于“not only...but also...”倒装用法的例句：
Not only does he speak English, but he also writes it fluently.
他不仅会说英语，而且写得也很流利。（助动词does提前）Not only is she beautiful, but she is also intelligent.
她不仅漂亮，而且聪明。（系动词is提前）Not only can he play the piano, but he can also sing beautifully.
他不仅会弹钢琴，而且歌唱得也很美。（情态动词can提前）Not only have they finished their homework, but they have also helped others with theirs.
他们不仅完成了自己的作业，还帮助了其他人完成作业。（助动词have提前）Not only will she attend the meeting, but she will also present a speech.
她不仅会参加会议，而且还会发表演讲。（助动词will提前）
在这些例子中，“not only”后面的部分使用了倒装结构，即把助动词、系动词或情态动词提到了主语之前，而“but also”后面的部分则保持了正常的语序。这种结构有助于突出两个并列成分的重要性，并增强句子的表达效果。
