as she got up late, she missed the first bus. 变为：
it was because she got up late that she missed the bus.
6. 强调句的否定转移：
有些否定句在变成强调句时，要把否定转移到被强调的词语之前。尤其是“not...until...句式的强调要特别注意。例如：
he didn't realize his mistake until the teacher had told him. 变为：
it wasn't until the teacher had told him that he realized his mistake.
注意】 在强调句式中，虽然not被提前，但“not...until...句型不要倒装。
高考中强调句型考查热点
考点一：强调句型的基本结构。
强调句型“it is / was + 被强调的成份 + that + 其他成份”用来强调主语、宾语和状语等成份。that只起连接作用，不作成份，但不能省略。有时强调的部分比较特殊，如主语从句、状语从句、名词、不定式短语、v-ing的复合结构等。
如：it was in the library that i saw her yesterday. 我昨天正是在图书馆见到她的。
考点二：特殊句式中的强调句型。
1. 如果强调的是特殊疑问句中的疑问词，表示“到底”、“究竟”等语气时，就用如下结构：
特殊疑问词 + is / was + it + that + 该句的其余部分”。如：
how is it that you usually go to work? 你通常是怎样去上班的？
2. 在强调“not...until”结构中由until所引导的短语（或从句）作时间状语时，要用固定的强调句型：
“it + is / was + not until...that + 该句的其余部分”，that所引导的从句中的谓语动词用肯定式。如：
his father didn't come back from work until 12
o'clock. =it was not until 12 o'clock that his father came home form work. 直到12点他的爸爸才下班回家。
考点三：强调句型与时间状语从句、定语从句的判断。
强调句型要注意和it代表时间、距离、温度、自然现象、具体事物或人物等时所构成的各种句型的区别。试比较：
it was on march 1 that i had my hair cut. (强调句)
it was march 1 when i had my hair cut. (后面是定语从句)
判断是否是强调句，可采用“还原法”。如果还原为一般句式后，句子各种成份完整，则是强调句。否则不是。
如第一句可还原成：i had my hair cut on march 1.
考点四：偶尔考查谓语动词的强调句式。
英语中常用助动词do、does或did强调谓语。如：
he did go to the airport yesterday, but he didn't find you. 他昨天确实去了机场，但他没有找到你。
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