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1. good - better - the best
old - older - the oldest
short - shorter - the shortest
tasty - tastier - the tastiest
interesting - more interesting - the most interesting
modern - more modern - the most modern 
tall - tall the tallest
dry - drier - the driest
talkative - more talkative - the most talkative
2. a) the most modern
b) better
c) taller
d) tastier
e) talkative
3. a) is
b) are
c) is 
d) are
e) are
4. a) Mary is not a good pupil.
b) Mike is not a clever boy.
c) Sue and Ann are not ten years old.
5. a) Is Tom fifteen?
b) Are you twenty-one?
c) Am I a student of the medical college?
6. a) I am the happiest person.