"Which" functions as both interrogative pronoun -- "Which is the least 
expensive car?" and as a relative pronoun: "The car which has the 
highest mileage is the least expensive one." It also takes an 
interrogative determiner function, as in "Which car is the least 
expensive one?" (it is modifying 'car', not replacing it).

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Johanna Rubba   Associate Professor, Linguistics
English Department, California Polytechnic State University
One Grand Avenue  • San Luis Obispo, CA 93407
Tel. (805)-756-2184  •  Fax: (805)-756-6374 • Dept. Phone.  756-2596
• E-mail: [log in to unmask] •      Home page: 
http://www.cla.calpoly.edu/~jrubba
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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