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: The effect of opening a marketplace is investing money in a business .

SOLUTION: The effect of opening a business is investing money in a business.

PROBLEM: If you want to drive your car then you should respect your keys .

SOLUTION: If you want to drive your car then you should reload your keys .

PROBLEM: If you want to walk around a wall then you should take a walk .

SOLUTION:
If you want to walk around a lake then you should design a walk .