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: The skateboarder wearing a black t-shirt and black pants is in front of the red brick building. Sentence 2: The skateboarder is in front a building.
The skateboarder is inside the building knocking on the door.

Sentence 1: A small brown dog runs through the grass in front of another dog and their owners. Sentence 2: 2 dogs and their owners play in the field
2 large dogs run in the house

Sentence 1: A sports player in a red shirt is falling to the ground with another sports player in a blue shirt stands behind him. Sentence 2: A sports player has a red shirt.
A sports player has a white shirt.