都按照一般疑问句形式倒装。
把be动词或助动词或情态动词提前到主语的前面。
Not until then did I realize my mistake.
Not until you finish your work can you go home.
Not until you finish your work are you allowed to watch TV.
娈为与该逻辑主语相对应的形式。
举个例子吧:
The sports meeting wouldn't be held until the rain stopped.
Not until the rain stopped until the sports meeting would be held.