Explications:
1)yes your(or he?) is older than my grandmother
2) yes my bed is more comfortable than (my?) yours.
3)it was (colder?) than the day before.
4)she is more intelligent than her brother.
5)your bag is (heavier?)than (my?)yours.
6) his address is longer than mine
7)the children are (tired) than us.
8) it's (gooder?) than last week
9)your father is taller than my mother
je pense que good,tired,heavy,cold sont sans doute irrégulier
