B2
Not until + O / S + V + did + S + V0
Not until ... did
讲解
强调事情直到某个时间点之后才发生。倒装出现在主句，而不是 not until 引导的从句里。不倒装的常规形式是 S + did not V + until ... 常见陷阱：倒装在主句，而不是 not until 从句：Not until did she call I understood ✗, Not until she called did I understand ✓。
例句
Not until midnight did the guests leave.
直到午夜，客人才离开。
Not until she called did I understand.
直到她打来电话，我才明白。
Not until last year did they open a branch here.
直到去年，他们才在这里开设分店。
Not until the report came out did prices fall.
直到报告发布，价格才下降。
练习
通过选择题测试你的掌握程度
高效学习“Not until + O / S + V + did + S + V0”
语法点“Not until + O / S + V + did + S + V0”（Not until ... did）是 CEFR 4 级别的重要结构之一。要熟练运用这个结构，你需要弄清楚它的使用语境，并经常练习。
学习小贴士：把例句大声朗读多遍，培养自然的语感反应。然后试着结合自己的生活情境造句。用发音按钮听标准发音并跟着练习。
你也可以查看完整课程“”，更深入地了解相关的语法和词汇。