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: If you want to serve customers then you should go to a store.

SOLUTION: If you want to use customers then you should stop to a store .

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 shower door in the shower bay .

SOLUTION:
You are likely to identify a shower door in the shower room .