TASK DEFINITION: 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.
PROBLEM: Sentence 1: A guy is sitting by a tree watching a girl sing with a blue bucket in front of her. Sentence 2: 2 people are by a tree

SOLUTION: two dogs are singing by a tree

PROBLEM: Sentence 1: A teenage boy is holding his skateboard. Sentence 2: A boy is posing with a skateboard.

SOLUTION: A boy is posing with a bicycle.

PROBLEM: Sentence 1: A motorcyclist is sporting a very colorful helmet. Sentence 2: A person is wearing a colorful helmet.

SOLUTION:
There is nothing on the person's head.