Use these for making formal dependent clauses: 1-- This is the book of which I was speaking (= this is the book I was speaking of) 2-- The table at which we sat was large and oval (= the table we sat at was large and oval) 3-- Please tell me in which car you will be travelling (= please tell me which car you will be travelling in) 4-- I lost the book for which this is the dust cover (= I lost the book this is the dustcover for) 5-- Many (or most) prepositions can be used in this same manner: about, within, outside, during, between, through , etc.
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