It is/was……that......强调句用法：
当需要强调句中的主语、宾语、状语时，我们常用“It is(was)+被强调部分＋that(who)”这种句型，使用此句型时，应注意以下几点。
1、一般情况用It is(was)……that…如：
He read three books in the library yesterday.
分别可以强调主语、宾语、地点状语和时间状语。如：
It was he who(that)read three books in the library yesterday.(强调主语）
It was three books that he read in the library yesterday.(强调宾语）
It was in the library that he read three books yesterday.(强调地点状语）
2、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 who(that)I met last week.
It is a new bike that his brother wants to buy.
3、强调状语时，只用that,不用when、where。
4、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.
5、一般疑问句的强调句为“Is （was) it ＋…．． that…？”；特殊疑问句为：“特殊疑问词＋ is （was) … ＋that…？”结构。
6、“not…until…”句型的强调结构为“It is not until…that…”应注意把否定词not转移到until前面。
如：it is not that i don't like her,but that we have nothing to say together.不是我不喜欢她,而是我们在一起没话说.