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: I left a coil out of wax .

SOLUTION: I made a candle out of wax.

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 exercise to play basketball then you should tread shoes .

SOLUTION:
If you LIKE to play basketball then you should substitute shoes .