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.

Example Input: You can use an underground area to protect from sky attack.
Example Output: You can use an underground area to protect from sky ash .

Example Input: If you want to enhance software then you should learn to program computers .
Example Output: If you want to classify software then you should rewrite to program computers .

Example Input: When you exit a mountain , you may respond to conserve some water .
Example Output:
When you climb a mountain , you may want to carry some compass .