TASK DEFINITION: Given a sentence, generate a new sentence by performing small changes on the sentence. Here, make sure that the changes are semantically related and syntactically similar to the input. And the generated sentence should have high commonsense plausibility, that is to have reasonable probability of it being true.
PROBLEM: You would ride a bike because you want some fresh air.

SOLUTION: You would load a bike because you wore some bulky case .

PROBLEM: You would serve customers because you had a bad job.

SOLUTION: You would neglect customers because you had a bad lunch .

PROBLEM: The effect of walking in the town is blue .

SOLUTION:
The effect of walking in the rain is blue.