Re I sat down on the rock where they had been sitting, Pence and Emery 
say this: "There comes a time when a man must fight.The relative adverb 
when introduces the adjectival clause when a man must fight and modifies 
must fight in its own clause. The expressed antecedent of when is time; 
therefore the subordinate clause functions as an adjectival modifier of 
time."
Gerald

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