Sentence1: A farmer woke up one morning, and found his pigs had gone missing. Sentence2: He asked his wife is she had taken them to town, and she denied it. Sentence3: He spent the day looking for the pigs,  he even checked other farms! Sentence4: At the end of the day, he went back into the barn to check again.
It turned out, the pigs had been left in the stables by mistake!