Here are a few simple hints to help you decide whether to use “who,” “that,” or “which” in the sentences that you write.
Use “who” when referring to people.
For example: The employee who answered my questions was very polite.
Use "that" for clauses that define something specific and provide necessary information.
For example: The pie that I made today was tart. (You are talking about a specific pie.)
Use "which" for clauses that can be removed without changing the meaning of the sentence. The movie, which I saw yesterday, was about a war hero.
Clauses that begin with “which” can be placed between commas or in parentheses.
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