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: A bike can only acquire a liberal amount of weight .

SOLUTION: A bike can only retain a certain stamp of advertising .

PROBLEM: You are likely to survive a game in a toy store .

SOLUTION: You are likely to recognise a game in a toy match .

PROBLEM: The effect of jumping out of a window is falling to the ground.

SOLUTION:
The day of jumping out of a window is falling to the ground .