The
sentence that uses grammar correctly is: Joan is the person who hired me. The
key is to use the right pronoun.
A
pronoun is used to substitute a noun. In order for it to substitute, it must
have a clear antecedent. Personal pronouns are used to substitute nouns with
ownership. There are three persons point of view.1st person is when
the subject is the one who is speaking (e.g. I, me, my, mine, we, us, our, ours). 2nd person is
when the subject is the one being spoken to (you, your, yours). 3rd person is when the subject is
the one spoken about (he, him, his,
she, her, hers, it, its, they, their, theirs).