English Grammar - Superlative Adjectives (most, best, etc.)

We use the superlative form to compare more than two people, things, places etc. We use the ... of/in with superlative adjectives.

http://www.youtube.com/watch?v=Qo6w_Lfurvw&feature=related

http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-62990.php

http://web2.uvcs.uvic.ca/courses/elc/studyzone/330/grammar/regcom.htm