改正为:
1.There are some students borrowing books in the library.【去are】
2.There are a lot of buildings in our city.【a lot of】
3.Some children are playing games in the park.【children 】
4.In this area,there is a sports center.【 sports形容词】
5.There is a hospital in front of the bookstore.【in front of在前面,in the front of在内部的前面】