强调句可以强调句子中除谓语外的任何部分,并且去掉(It+was/is+who/whom/that)这个结构后句子仍能成立.

　　例:Allthemembersheldameetingintheclubyesterday.

　　（强调allthemembers）Itwasallthemembersthatheldameetingintheclubyesterday.

　　（强调ameeting）Itwasameetingthatallthemembersheldintheclubyesterday.

　　（强调intheclub）Itwasintheclubthatallthemembersheldameetingyesterday.

　　（强调yesterday）Itwasyesterdaythatallthemembersheldameetingintheclub.

　　It作形式主语代替主语从句,主要是为了平衡句子结构,主语从句的连接词没有变化.而it引导的强调句则是对句子某一部分进行强调,无论强调的是什么成分,都可用连词that.被强调部分指人是也可用who/whom.主语从句：Itis+形容词/名词/某些动词ed+that从句.