There are a few things to note than learning to say I, you, he, she and it in Mandarin. There are two ways of addressing someone with you in Mandarin. The most common one is nĭ(你), this is the informal way. If you don’t know someone, or want to show respect to someone such as your boss you use nín (您).
He, she and it are all prounouced tā, however the writtingis different in for each of them.
If you would like to say we, you (pl.) or they; you use the words for i,you or he and add the word men (们)