释义：

start it 开始

it 为之前已经提到过的话题，可以用来明确到底是谁先开始的和各种是是非非。

例句：

I started it but, now it's scaring me.
是我开始的，不过现在我有点害怕了。
She's the one that started it.
是她先开始的。
You started it. Everybody knows that!
是你先开始的，大家都知道！

对话：

A: Many people were killed in the war.
很多人在战争中丧失了生命。
B: I wonder which country started it.
真想知道是哪个国家先挑起战事的。