Choosing a relative pronoun

Choose carefully between that, which, and who.

As a general rule, use that when a relative clause is restrictive (without a comma), which when a relative clause is non-restrictive (with a comma), and who in either case whenever the antecedent is a person.

No: This is the main problem, which we must solve.

Yes: This is the main problem that we must solve.

No: She was wearing a coat, that was sky-blue.

Yes: She was wearing a coat, which was sky-blue.

No: I know a man that owns twenty horses.

Yes: I know a man who owns twenty horses.

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