not until的意思為｢直到...才｣，而not until有倒裝句及以it當主詞的用法，而not until所連接的兩個子句時態需一致。

Not until ...+助動詞+S+V...(倒裝句用法，Not until置於句首，通常為強調語氣，而主要子句需要倒裝：助動詞+S+V)
=It+be+not until...+that+S+V...
=S+助動詞+not ....until+S+V...

Not until the girlfriend went into the house did Jack leave. (Jack一直到女友進到屋子後才離開)
=It was not until the girlfriend went into the house that Jack left.

Not until the pet left did Alex realize its importance.(直到寵物跑掉，Alex才知道它的重要)
=Alex did not realize the importance of his pet until it left.

參見(See also)
副詞子句(adverb clause)
as soon as與upon用法(Usage of as soon as and upon)

as soon as與as long as用法(Usage of as soon as and as long as)

not until用法(Usage of not until)

so that用法(Usage of so that)

as result of/result in用法(Usage of as result of/result)

because/because of用法(Usage of because/because of)
倒裝句(Inversion)
so/neither用法(Usage of so/neither)
not until用法(Usage of not until)

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晚上10:25

so及neither為英文中的附和句附和句用來附和他人的陳述，表達｢也…｣｢也不…｣，例如常聽到的So do I、Neither do I。

其中，so及too表示｢也…｣(肯定附和句)，neither及either表示｢也不…｣(否定附和句)，句型用法如下：

Bob likes chocolate. So do I.(Bob喜歡巧克力，我也喜歡)

=Bob likes chocolate, and so do I.

=Bob likes chocolate, and I do, too.

Karl isn’t a teacher. Neither is James.

=Karl isn’t a teacher, and neither is James.

=Karl isn’t a teacher, and James isn’t, either.

※注意：主要子句和附和句的助動詞及時態必須一致，用so或neither必須用倒裝句。

主要子句使用be動詞或助動詞→附和句用be動詞或助動詞

主要子句使用一般動詞→附和句用do/does/did

主要子句為完成式→附和句用have/has

參見(See also)
倒裝句(Inversion)
so/neither用法(Usage of so/neither)
not until用法(Usage of not until)

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晚上7:40