In this task, you're given a pair of sentences, sentence 1 and sentence 2, that agree with each other. Your job is to alter sentence 2 so that the pair contradict each other. Generated sentences must be short, with less than 15 words. New information can be introduced. Avoid using pronouns to confuse the subject of the sentence.

Sentence 1: Two men in black clothes inspect the motor of a racing car while the top of the car is lifted. Sentence 2: Two males are standing near a race car.
Two men are going 200 mph inside a race car.

Sentence 1: A white dog is running with an orange fence behind him. Sentence 2: A white dog is running outside.
A white dog is sitting on the porch.

Sentence 1: a boy smiles underwater. Sentence 2: The boy is smiling.

The boy is asleep.