Relative clauses
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We use relative clauses to give additional information about something without starting another sentence. There are three standard relative pronouns used in relative clauses: who, which, and that.
WHO is used for people
Do you know the man who lives next door?
WHICH is used for things
I decided on the color which matched my eyes.
THAT is used instead of both WHO and WHICH but it cannot be used after a comma
I'll give you the book that I really enjoyed reading.
I met the man that was on television last night.
>>>> I met Mr Parks, who got divorced last year.
WHO, WHICH and THAT are often left out
The man I told you about last week has just moved in. (or: The man who (that) I told you….) – no commas here
They cannot be left out if they introduce a clause which is not so important (it is an extra information clause)
My uncle Tom, who lives in San Diego, is 85 years old. (an extra information clause needs commas)
Other relative pronouns
WHOSE represents possessive adjectives
We met a girl whose parents had died in a car crash. (= her parents)
WHERE is used to indicate a place
The restaurant where we had dinner last week belongs to a friend of ours.
WHICH can be also used to relate to the whole previous sentence
I came in time, which surprised everybody.
SPECIAL FORMS of extra information clauses
All of / most of / both of / neither of / many of / two of / three of / some of… + WHOM / WHICH
Jackie has a lot of friends, most of whom are alcoholics.
Don gave me two books, both of which I had read.