Find the mistake :
1. From at nine in the morning until four in th afternoon, Mr Tuan works in the field.
2. There is fewer work in the evening than there is in the morning.
3. The doctor says you should a little time to play videos games.
4. The public library in the city has thousand good books.
5. Ba is in the class 7A and he enjoys the school very much.
6. My father always has a lot of housework to do.
7. There is a ten-floors building in front of my house.