强调句：英语的强调主要有两种：一是强调非谓语(包括主语、宾语、状语等)；二是强调谓语动词。
(一)强调非谓语
其基本句型是：“It + is/was + 被强调的成分 + that/who + 其她成分”。It 没有实意，只起语法作用，引导被强调的部分。当被强调的是人时，可用who(m)/that, 其他情况用that。
2、强调状语：
(1)强调时间状语。
例如：
It was at that moment that he changed his mind.是在那一刻他改变了主意。
It is every day that Professor Smith goes swimming.史密斯教授是天天去游泳。
It was not until Saturday that he began to prepare for the examination. 他直到星期六才开始为考试作准备。
注意：这句话的原句是He did not begin to prepare for the examination until Saturday. 变成强调时间状语，注意 “not” 位置的变化。
(2)强调地点状语。
例如：
It was in the library that I met Jack yesterday.是在图书馆我昨天碰到了Jack.
原句：I met Jack in the library yesterday.
It might have been on the bus that I lost my purse.可能是在公共汽车上我丢失了钱包。
原句是：I might have lost my purse on the bus. 强调地点状语，
也可改为：It was on the bus that I might have lost my purse.
It was under the tree that I was sitting then. 当时我正坐在那棵树下。
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