Relative Pronouns

who - refers to the person that is the SUBJECT in the sentence (who the whole sentence is about)

whom - refers to a person in the sentence that IS NOT the subject

whose - possesive form of who, shows ownership of something

that - use with essential clauses in a sentence, meaning it has to be there to be understood, and does not use commas

which - used with non-essential clauses in sentences that just give us extra information, but are not important to the core meaning of the sentence, and DO use commas

all of these talk about PEOPLE

Jane, who is older than me, plays the guitar.

Ty, whom Mark yelled at, left the party.

Kyle, whose bike is broken, walked to school.

These talk about THINGS.

The lamp that is on the table is broken.

Cats, which are carnivores, love to hunt.

Whose animals are those?