1) Are there four girls there? - Yes, they are.
2) Are they going to ski? - Yes, they are.
3) Does it often rain in May? - Yes, it does.
4) Is he her uncle? - Yes, he is.
5) Has he got an aunt? - Yes, he has.
6) Will you swim in the river? - Yes, I will.
7) Did she meet Mrs Green there? - Yes, she did.
8) Does she often meet Mrs Green? - Yes, she does.