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常见的强调句结构是it 引导的句子。 It is 被强调部分+ that + 句子其他部分。 此结构强调的成分仅限于主语，宾语和状语。 It is from the sun that we get light and heat. It was not until I had read your letter that I understood the true state of affairs. 使用此句型时, 应注意以下几点。 一般情况用It isthat如: He read three books in the library yesterday. 我们分别可以强调主语、宾语、地点状语和时间状语。如: It was he whoread three books in the library yesterday. It was three books that he read in the library yesterday. It was in the library that he read three books yesterday. 当被强调部分指人时, 可用that, 也可用who; 指物时, 只用that, 如: It was Tom whoI met last week. It is a new boke that his brother wants to buy. 强调状语时, 只用that, 不用when、where. 如: It is at 5 oclock that the train will arrive. 被强调的部分是主语时, 注意句子的谓语动词和被强调的主语保持一致。如: It is he who is late. It is they that were late. 一般疑问句的强调句为Is it + that? 特殊疑问句为: 特殊疑问词+ is +that?结构。如: | 
