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 learn a language because you want to correspond with a family.

SOLUTION: You would help a mission because you want to correspond with a buddy .

PROBLEM: Expensive chocolate melts at mid temperature .

SOLUTION: Expensive chocolate melts at face temperature .

PROBLEM: I go to a health food store to purchase organic produce.

SOLUTION:
I go to a health gardening store to purchase organic produce .