Correct the mistakes

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6. Correct the mistakes:
1. There are a library round the corner.
2. There is two cats under the tree.
3. There are a flower pot on the floor.
4. There are many flower in the room.
5. There is three cars in the yard.
6. There is two birds on the tree.
7. There are a boy and a girl there.
8. There is a lot of students at the conference.
9. There are two portrait on the wall.
10. There is three umbrellas in the corner.
11. There are some cake on the table.
12. There is two apples on the plate.
13. There are many potato in the basket.
14. There is two tomatoes on the plate.