instruction:
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.
question:
Sentence 1: A man riding a brown horse poses in front of a mountain scene. Sentence 2: A man is on a horse in front of some mountains.
answer:
A man is riding a polar bear.


question:
Sentence 1: A seminar in an auditorium. Sentence 2:  A seminar in the auditorium.
answer:
A seminar on a beach in the water.


question:
Sentence 1: A man in a cap teaches children proper bike maintenance. Sentence 2: A man is teaching some children.
answer:

A lady is watching a movie.