Ex 6
1. in -> on
2. goes -> go
3. have -> has
4. does -> do
5. has -> have
6. she face -> her face
7. time she -> time does she
8. has->have
9. Nga school -> Nga's school
10. at -> in
Ex 7
1. Is this my school?
2. Thu's house is small.
3. There are nine hunred students in this school