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 are likely to find a wall in a classroom.

SOLUTION: You are likely to mark a wall in a classroom .

PROBLEM: You would start ice cheese because you 're hungry .

SOLUTION: You would eat cel arine because you 're hungry .

PROBLEM: A graph can summarize pages of boring conversations .

SOLUTION:
A graph can summarize pages of boring numbers.