强调结构
强调结构（Emphatic Structure），是指在句子当中，有时为了突出句子的某些成分以加强语气，增强情感色彩或加强对比，需要改变句子结构的结构。
基本概况
Do(does/did)+原形动词表强调
此种结构来强调谓语动词，往往只用于一般现在时或一般过去时的肯定句或肯定结构的祈使句。不适用于"be"动词。
She does know the place well.
The children do hope to go to college.
She did come yesterday.
Do come and visit us!
Do shut up!
Do be careful!
It is/was ... that(who)结构表强调
It is/was ... that(who)结构表强调是，谓语动词不能做强调成分。这种结构通常用来强调主语，也被称为分裂句。
It was I who killed the beast.
What sb/sth ... is/was ...结构表强调
这种结构往往用来强调动作，也是一种分裂句的形式。
e.g.
What he wants to do is (to) leave her.