it
01
它, 牠
(subjective third-person singular pronoun) used when referring to something or an animal as the subject of a sentence
例子
It is raining heavily outside.
外面正下着大雨。
02
它, 它
(objective third-person singular pronoun) used when referring to something or an animal of unknown sex as the object of a sentence
例子
I found a wallet on the street and handed it to the police.
我在街上发现了一个钱包，并把它交给了警察。
03
它, 这
used in a sentence to fulfil a grammatical function without a clear antecedent for it to refer to
例子
It is raining outside.
外面在下雨。
