I also have a sentence : he stayed here six months, during which time he helped me a great deal in my study. I'm sure the word "wich" in my sentence is used as an adjective rather than as an relative pronoun, so this is a appositive clause rather than a relative clause. I think we aslo can not place "during" at the end of the sentence, though I don't know why.
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English 1b3My apprehension about this dissipated after the first 10 minutes, by which point I knew that I was in great hands.Strictly speaking, I suppose you could
The man they called John died in 2009, at which time I was in Africa.
BillJIn each example, ‘which’ is a function word being used to introduce a nonrestrictive relative clause, and to modify a noun, (‘point’ and ‘time’) in that clause - so ‘which’ is an adjective not a pronoun. Together with that noun it is referring to a word group (e.g. a phrase) in a preceding clause - in your examples: ‘after the first ten minutes
English 1b3if [which] were solely an adjective, then my sentences would be comma splices--ungrammaticalTrue. I think that
CalifJim
My apprehension about this dissipated after the first 10 minutes, by that point I knew that I was in great hands.
That was why I suggested the unorthodox term 'relative determiner' if you really need to name the function of which in those sentences. You seem to understand the function quite well with