His is a possessive pronoun and can be used both as a subject phrase and an object phrase. It can't be used alone as a subject or object, his requires the noun that belongs to the word.subject: His...
You is a subjective and objective pronoun. You is also singular and plural. Examples: Subject: You can catch the six o'clock train. Object: Carl left this book for you.Plural: I made enough...
"They" is a subject pronoun, since it is the opening word of the phrase. For example: They ate lunch. They played with me. If it was an object pronoun, it would read: I played with they. Since you...