来自：查字典高考网 2011-08-31
一、强调句句型
1. 陈述句的强调句型：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。
e.g. It was yesterday that he met Li Ping.
2. 一般疑问句的强调句型：同上，只是把is/ was提到it前面。
e.g. Was it yesterday that he met Li Ping?
3. 特殊疑问句的强调句型：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?
e.g. When and where was it that you were born?
4. 强调句例句：针对I met Li Ming at the railway station yesterday.句子进行强调。
强调主语：It was I that (who) met Li Ming at the railway station yesterday.
强调宾语：It was Li Ming that I met at the railway station yesterday.
强调地点状语：It was at the railway station that I met Li Ming yesterday.
强调时间状语：It was yesterday that I met Li Ming at the railway station.
5. 注意：构成强调句的it本身没有词义;强调句中的连接词一般只用that， who，即使在强调时间状语和地点状语时也如此，that， who不可省略;强调句中的时态只用两种，一般现在时和一般过去时。原句谓语动词是一般过去时、过去完成时和过去进行时，用It was ，其余的时态用It is .
二、not until 句型的强调句
1. 句型为：It is/ was not until + 被强调部分 + that + 其他部分
e.g. 普通句：He didnt 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.
2. 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。
三、谓语动词的强调
1. 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.
e.g. Do sit down. 务必请坐。
He did write to you last week. 上周他确实给你写了信。
Do be careful when you cross the street. 过马路时，务必(千万)要小心啊!
2. 注意：此种强调只用do/ does和did，没有别的形式;过去时用did，后面的谓语动词用原形。
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