its主格是it

我 他 她 它 你

1.主格人称代词:i,he,she,it,you

2.宾格人称代词:me,him,she,it,you

3.名词性物主代词:mine,his,hers,its,yours

4.形容词性物主代词:my,his,her,its,your

The school is the first of its kind in Britain.

这是英国同类学校中最早的一所。

Water will always find its own level.

水总会自行流平。

Its brain is small in relation to its body.

和它的身体相比，它的大脑很小。