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 knock a couple in the grass .

SOLUTION: You are likely to enter a lake in the grass .

PROBLEM: The source basically wants java .

SOLUTION: The world basically wants peace.

PROBLEM: Having lunch is for eating a sandwich on a park bench.

SOLUTION:
Having lunch is for eating a jog on a park el .