Here is a practice:
Q: A minute passed in complete silence. Terri announced her wedding plans then.
I wrote: A minute passed in complete silence when Terri announced her wedding plans.
A: A minute when Terri announced her wedding plans passed in complete silence.
Grammar rules say: The adjective clause is used to modify a noun or a pronoun. It will begin with a relative pronoun (who, whose, whom, which, and that) or a subordinate conjunction (when and where). Those are the only words that can be used to introduce an adjective clause. The introductory word will always rename the word that it follows and modifies except when used with a preposition which will come between the introductory word and the word it renames.
It seems to me the official answer is a strict product of the rules and does not sound natural to me. If "when Terri announced her wedding plans" is to highlight/modify "minute" (as the grammar rule indicates), shouldn't the article "A" be a definite "The" specifying the time in a period of ONE MINUTE when the wedding plans were announced?
I just thought the length of time (a minute) was more of a figurative speech when the silence occured as a result of Terri's announcing her wedding plans not the precise minute that it took to announce her wedding plans. Any thoughts? Thanks a lot.
Raen