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It is/ was + 被强调部分（通常是主语、宾语或状语）+ that/ who（当强调主语且主语指人）+ 其他部分。
It was yesterday that he met Li Ping.
Was it yesterday that he met Li Ping?
被强调部分（通常是疑问代词或疑问副词）+ is/ was + it + that/ who + 其他部分？
When and where was it that you were born?
4.not … until … 句型的强调句
A. 句型为：It is/ was not until + 被强调部分 + that + 其他部分
普通句：He didn‘t go to bed until/ till his wife came back.
强调句：It was not until his wife came back that he went to bed.
B. 注意： 此句型只用until，不用till。但如果不是强调句型，till, until可通用；因为句型中It is/ was not ... 已经是否定句了，that后面的从句要用肯定句，切勿再用否定句了。
A. It is/ was ... that ... 结构不能强调谓语，如果需要强调谓语时，用助动词do/ does或did
Do sit down. 务必请坐。
Do be careful when you cross the street. 过马路时，务必（千万）要小心啊！B. 注意： 此种强调只用do/ does和did，没有别