instruction:
In this task, you're given a pair of sentences, sentence 1 and sentence 2, that neither agree with nor contradict each other. Your job is to alter sentence 2 so that the pair clearly 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 standing on a surfboard heads away from shore while going over a wave near a small boat. Sentence 2: A skilled surfboarder rides a wave
answer:
A man on a surfboard rides a wave


question:
Sentence 1: Snow kicks up as a man sleds down an icy hill, behind him are many pine trees. Sentence 2: A man is sledding down a hill to his house.
answer:
A man is outdoors.


question:
Sentence 1: A small boy is building with some wooden blocks. Sentence 2: A boy is building a castle.
answer:

A boy is building something.