1 It is big
2 There are 4 rooms, they are a kitchen, a living room, a big dining room and a bathroom
3 Because it is very spacious and there is a big sofa there
4 It is at the back of the house
6 yes, it is
7 yes, he does
Ex16
1 is swimming
2 am reading
3 is enjoying
4 are playing
5 are doing
6 are skipping
7 are studying
8 is knocking

