not until的强调句型有两种：
1.not until的强调句型：可用于表示强调的语气
"not until"强调句型："It is / was not until + 从句/表示时间的词 + that + 句子的其余部分"。
not...until 的强调结构，其基本句型为：
It is (was) not until (时间状语) that (不用否定)
not…until…结构是不同的。它们是一体的，如果想要强调until后面的部分，不仅仅需要把until部分提前，还要把not一起提前才可。整个句子相应的也会有一点改变。
直到她拿下黑墨镜，我才已意识到她是一位闻名的歌唱家。
It was not _until she took off her dark glasses that I realized she was a famous singer.
原句：I didn’t realize she was a famous singer until he took off her dark glass.
I didn’t realized that she was one of my classmates until she took off her sunglasses.
直到她脱下太阳镜我才认识到她是我的一个同学。
It was not until she took off her sunglasses that I realized that she was one of my classmates.
他妻子走了之后他才来。
正：He didn’t come until his wife left.
正：It was not until his wife left that he came.
直到雨停他们才出发。
正：They didn’t start until the rain stopped.
正：It was not until the rain stopped that they started.
再看下列句子：
It was not until midnight that the noise of the street stopped.
It was not until 2022 that regular radio broadcast began.
It was not until you had explained how that I managed to do it.
It was not until yesterday that I learned it.顶昨天我才听说这件事。
It was not until 2023 that his ability to write gelled again.
直到2023年，他的写作才华才又得以发挥。
试将下列句子改为it is…that…强调句，强调until部分。
1: Tom didnt go to sleep until the programme was over.
2: Tom didn’t understand it until his teacher had explained it three times.
3: I won’t leave until you give me my money.
4: They didn’t begain the lunch until I came back.
参考答案：
1: It was not until the programme was over that Tom went to sleep.
2: It was not until his teacher had explained it three times that Tom understood it.
3: It is not until you give me my money that I will leave.
4: It was not until I came back that they began the lunch.
二、not until的倒装句型：可用于表示强调的语气
not until的倒装句型： "not until"引导的倒装句常常用于句首，构成否定句并强调时间延迟。
这种结构的句子是的：
Not until+从句/表时间的词+助动词+(主句)主语+谓语+
例如：
Not until they heard that she was safe and sound were their minds set at rest.
听到她平安无事的消息，大家心里才一块石头落地。
Not until we pointed out their fault to them did they realize it.
直到我们向他们指出了他们的错误，他们才意识到。
Not until tomorrow will she start her new job.直到明天她才会开始新工作。
Not until the guests arrived did we begin to prepare dinner.直到客人到达我们才开始准备晚餐。