A. There are relative
adverbs where, when, and why.
The houses where I used to live has been knockdown
Do you
remember the time when we all went
to a night club?
The reason why we can sell so cheapy is because we
buy in bulk.
We
use where
after nuons like place, area, town,
country, house, situation. We use when after nouns like time, day, weekend, moment, period. And we
use why
after reason.
B. We can use where and when without a noun.
This is
where I used to live.
(the place where I used to live)
Remember
when we went to a club.
(the time when we went to a club)
C. Instead of a
clause with where, we can use these
patterns.
This is the
house in which I used to live.
This is the
house that I used to live in.
This is the
house I used to live in.
The pattern
with in which is rather formal. In formal
English yhe house I used to live in is
more usual. Instead of when or why, we can use this pattern.
Do you
remember the time (that) we all went
to a night club?
The reason (that) we can sell so cheapy is because
we buy in bulk.
D. Clauses with
when or where can be separated off by commas.
We walked up to the top of the hill, where we got a marvelous view.
I’d rather go next week, when
I won’t be so bussy.
We do not leave out where or when here, and we do not use that.
E.
With the noun way, we
can use these patterns.
I hate the way in which these adverts pop up on the screen.
I hate the way that these adverts pop up on the
screen.
I hate the way in which these adverts pop up on
the screen.
The way in
which
is more informal.
We can also use how.
I hate how these adverts pop up on the screen.
Source: Eastwood, Jhon. Learner’s Pocket Grammar. Oxford University
Press.