2.111 qualifiers after comparatives
Comparatives are often followed by 'than' when you want to specify what the other thing involved in the comparison is. You say exactly what you are comparing by using one of a number of structures after 'than'. These structures can be
* noun groups
Note that when 'than' is followed by a pronoun on its own, the pronoun must be an object pronoun such as 'me', 'him', or 'her'.
* adjuncts
* clauses
Note that when a comparative is not followed by a 'than' phrase, the other thing in the comparison should be obvious. For example, if someone says 'Could I have a bigger one, please ?' they are likely to be holding the item which they think is too small.