in which=where (place)
This is the town in which I used
to live
for which =why (reason)
Are those reasons for which you choose to
go to Africa instead of
America?
on which=when (time)
I have not fixed the date on which I'll
go abroad
เครดิต http://www.lks.ac.th/teacher_jonggonee/kaidream/defining_relative.html
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