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Where – marks place (can be omitted, but must be replaced by a preposition)
The school
where
he teaches is very old.
The school he teaches in is very old.
Why – shows a reason (can also be omitted)
No one knows the reason
why
he skips school.
No one knows the reason he skips school.
Essential Clauses
Commas often seem confusing, but they’re really not hard to understand. (See
the chapter on punctuation to find out more.) When it comes to adjective clauses,
you need to consider the exact meaning of the sentence before you use a comma.
Incorrect comma use can change the whole meaning!
Ask yourself if the information in the adjective clause is
essential
to under-
standing the noun, or if it is just
extra
information. If it is essential, then we call
this an
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