Relative clauses, like prepositional phrases, can be either adverbial or adjectival.
Modifiers of location and time are simply not adjectival.  Time and location are
aspects of verbs and adverbs not nouns.  No adjectical of any way
or sort could ever indicate time or location.  They answer the questions
of "where" and "when" and thus are adverbial and modify the verb not the noun
that is the apparent but false antecedent.

Phil Bralich

-----Original Message-----
>From: Gerald Walton <[log in to unmask]>
>Sent: Aug 11, 2009 8:02 PM
>To: [log in to unmask]
>Subject: Re: Grammar question
>
>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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