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 humidity can spin out after the rain .

SOLUTION: The ust can filter out after the rain .

PROBLEM: An x is used for communicating through the postal system .

SOLUTION: An envelope is used for reading through the postal system .

PROBLEM: You are likely to find a creature in any ocean.

SOLUTION:
You are likely to find a host in any ocean .