强调句的用法
强调句的用法： 当句子中的主语、宾语、状语需要强调时，可以使用强调句型。
强调句型的结构为：“It is (was) + 被强调部分 + that (which, who, whom) + 句中其他部分”。动词be的时态可随that从句的时态的变化而变化。例如：It is the bag that costs 300 dollars. (强调主语)It was three books that he read in the library yesterday. (强调宾语) It was yesterday that I met him in the street. （强调时间状语）使用此句型时，应注意以下几点：1. 当被强调的部分指人时，要用who或that。当被强调的部分是宾语，又是指人时，要用whom或that，但通常多用that。It was a young scientist who (that) solved this problem five years ago.（强调主语）正是一位年轻的科学家五年前解决了这个问题。It was Li Ming whom (that) I met at the railway station last week. (强调宾语)上个星期我在车站遇到的人正是李明。
2. 当被强调部分指物时，只用that。It is a new bike that his brother wants to buy.他兄弟想买的正是一辆新自行车。It was the legislature that played the decisive role in declaring war.正是立法机构在宣战时起决定性作用。3. 当被强调的部分是状语时，只能用that，不能用when或where。It was because her mother was ill that she didn’t go with us.正是因为她母亲病了，她才没有和我们一起去。It was in the library that he borrowed that novel.正是在图书馆里他借了那本小说。4. 当被强调的部分是主语时，句子的谓语动词要和被强调的主语保持一致。It is he who is late.正是他迟到了。It is they that were late.正是他们迟到了。
