it is…that强调句型结构

英语常用的强调结构是\"It is (was)+被强调部分(主语、宾语或状语)+who (that)...\"。一般说来,被强调部分指人时,用who;指事物时用that,但that也可以指人。在美国英语中指事物时常用which来代替that。

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。

例如It was yesterday that he met Li Ping. 昨天他遇到了李平。

2、 一般疑问句的强调句型

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。同上，只是把is/ was提到it前面。

例如Was it yesterday that he met Li Ping? 昨天他遇到了李萍吗？

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？

例如When and where was it that you were born? 你何时何地出生？

4、not … until … 句型的强调句

句型为It is/ was not until + 被强调部分 + that + 其他部分；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。

普通句He didn\'t 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.

5、谓语动词的强调

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.

例如Do sit down. 务必请坐。Do be careful when you cross the street. 过马路时，务必（千万）要小心啊！

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。