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: Happiness is sometimes thought of as a vein of sunshine .

SOLUTION: Temperature is however thought of as a fraction of sunshine .

PROBLEM: You are likely to find a bee in an apple tree.

SOLUTION:
You are likely to bite a bee in an apple tree .