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Restrictive Clauses
gives more information about a noun
necessary for clarity
answers the question "which?"
does not need commas
does not look the same everywhere
Mrs. Brown
Miss. Black
The woman who has glasses is my teacher.
Mrs. Gray, who has glasses, is my teacher.
Mrs. Gray
Ms. White
Who
Which
The apple tree which produced no apples last year has loads of blossom.
(This is acceptable to Brits but not to most Americans.)
The apple tree that produced no apples last year has loads of blossom.
(This is acceptable to Brits and Americans.)
That
As a general rule, who is used for people, and which and that are used for things (formally). However, it is not uncommon to see that used with people.
That never starts a non-restrictive clause (not in British English or American English). So, you'll never get a comma before an adjective clause that starts with that. That is strictly for restrictive clauses.
incorrect:
Almas" caviar, that costs over £20,000 per kilo, comes from the Iranian Beluga fish and is the most expensive food in the world.
correct:
Almas" caviar, which costs over £20,000 per kilo, comes from the Iranian Beluga fish and is the most expensive food in the world.
create a more natural-sounding sentence by removing the who, that, or which.
example:
The dog which you fed is outside. (British)
The dog that you fed is outside. (American)
The dog you fed is outside.
Making your sentences as natural as possible is the key. Read it out loud to see if it sounds weird or not.
https://www.grammar-monster.com/glossary/restrictive_clause.htm