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 can type money in a bank to trust it .

SOLUTION: You can put money in a bank to play it .

PROBLEM: You can purchase the bear at retail .

SOLUTION: You can see the process at Edit .

PROBLEM: A heart is used for getting marrow to cells .

SOLUTION:
A heart is used for getting oxygen to cells.