Relative Pronouns

THAT, WHICH, WHO, WHOM & WHOSE

They are used for Relative Clauses, which tell us more about people and things.

WHAT, WHEN, WHERE, HOW, WHO & WHY are used for Nominal Relative Clauses, where we talk about the thing that.

  “The beta test which we ran recently has been very useful.”

  “That's what I was talking about during the meeting.”

  “That’s who I’m talking about. She’s going to run the new project.”

  “It’s not my team whose data is being questioned.”

The relative pronoun which we use the most is what.