1) adv. (used with the comparative form of adjectives and with good ) ~ better (I wonder if they can work ~ better); ~ good (I don't think that this wine is ~ good); ~ easier (that doesn't make my job ~ easier); ~ more difficult (do not make my job ~ more difficult than it is now)
2) determiner , pronoun ~ to + inf. (we don't have ~ books to sell; we don't have ~ to sell)
3) determiner , pronoun ~ of (I did not see ~ of them)
USAGE NOTE: The use of the preposition of is necessary when a pronoun follows. When a noun follows, the use of of the limits the meaning
--did you see ~ students? did you see ~ of the students whom we had discussed earlier?
( see the Usage Note for something )