Corrected Sentences:
- There is a teddy bear in the box. (✓)
- There are two balls in the box. (✓)
- There is a cat in the box. (X)
- There is a rabbit in the box. (✓)
- There are cars in the box. (X)
- There is a mouse in the box. (X)
- There are three boxes on the shelf. (✓)
- There are nine books on the shelf. (✓)
- There are balls on the shelf. (X)
- There is a car on the shelf. (✓)
- There is a teddy bear on the shelf. (X)
- There are dolls on the shelf. (X)
Explanation: We use 'There is' for singular nouns and 'There are' for plural nouns. The provided image marks several sentences incorrectly.