Hello,
a) my bother / good at maths / my sister
comparatif de supériorité → My brother is better at maths than my sister
comparatif d'égalité à la f. négative → My brother isn't as good at maths as my sister.
b) girls/ determined / boys
→ Girls are more determined than boys.
→ Girls aren't as determined as boys.
c) a lane ( ruelle) / narrow / road
→ A lane is narrower than a road.
→ A lane isn't as narrow as a road.
d) the South of England / rainy / the South of France
→ The South of England is rainier than the South of France.
→ The South of English isn't as rainy as the South of France.
En espérant t'avoir aidé(e) ! ^^