C2
It + be + not until + time + that + S + V · It + be + only when + S + V + that + S + V
It was not until / It is only when
讲解
分裂句中被强调的部分带有否定或限定的含义。被强调的部分位于 be 与 that 之间。与倒装结构 Not until ... did 不同，这里两个分句都保持主语加动词的原有语序，所以更容易写对。 常见错误：强调部分之后用 that，不用 when：It was not until 1990 when the law changed ✗, that the law changed ✓.
例句
It was not until 1990 that the law changed.
直到1990年，法律才发生变化。
It is only when you read the annexe that the cost appears.
只有读了附录，才会发现成本。
It was not the delay that annoyed us but the silence.
让我们不快的不是延误，而是沉默。
It is precisely this clause that lawyers dispute.
律师们争议的恰恰就是这一条款。
练习
通过选择题测试你的掌握程度
高效学习“It + be + not until + time + that + S + V · It + be + only when + S + V + that + S + V”
语法点“It + be + not until + time + that + S + V · It + be + only when + S + V + that + S + V”（It was not until / It is only when）是 CEFR 6 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。