关于英语倒装句和强调句　.　请帮我看下这两题怎么改.

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1. 倒装句：Not until the teacher came in did the students stop talking.
强调句：It was not until the teacher came in that the students stopped talking.

2. 倒装句：Not until he got a serious disease did he give up smoking.
强调句：It was not until he got a serioius disease that he gave up smoking.

注：not...until的倒装句/强调句如下（如果until做连词引导时间状语从句,且时态均为一般过去时时）：
倒装句：Not until + 从句 + did + 主句主语 + 主句谓语动词原形...
强调句：It was not until + 从句 + that + 主句（改为肯定句）


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Until the teacher came in,the students didn't stop talking .
Until he got a serious disease,He didn't give up smoking.