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 summon a ninja to switch hills .

SOLUTION: You can save a goat to join hills .

PROBLEM: CCC is the name that we give our mistakes .

SOLUTION: Experience is the name that we give our mistakes.

PROBLEM: If you want to suffer then you should buy some board and knitting lengths .

SOLUTION:
If you want to speed then you should buy some wool and knitting classes .