赖世雄教你学英语语法
代词
1-3：it用以强调主语或宾语
例：I love him.
---- It is I who (或that) love him.
（爱他的是我。）
His words made me angry.
---- It was his words that（或which）made me angry.
（使我生气的是他的话。）
I am in need of your help.
---- It is your help that（或which）I am in need of.
（我需要的是你的协助。）