1
(Alan's) car is new and all his (friends) love it.
2.
There are my (dogs) and the black one is (Peter's).
3.
We always stay at my (friends') house when they are away.
4. I
like (Dave's) garden, it's so big, not like my (parents').
5. I
often take my (neighbour's) dog for a walk when she asks me.