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 would sign a contract because you want to restore a house .

SOLUTION: You would sign a contract because you want to buy a house.

PROBLEM: An Idea to join the team would make you want to play ball .

SOLUTION: An invitation to join the fight would make you want to play ball .

PROBLEM: If you want to mix then you should find a pen and paper .

SOLUTION:
If you want to write then you should find a pen and paper.