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.

You are likely to find a grape in a lunch box.
You are likely to find a number in a result box .

You can use a roof to provide shelter.
You can heat a roof to provide concrete .

If you want to wage war then you should have an army.

If you tend to invite war then you should have an army .