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 are likely to drag a hair in your bed .

SOLUTION: You are likely to find a meteor in your bed .

PROBLEM: You are determined to rub a hat in a chalk box .

SOLUTION: You are OK to sniff a hat in a broom box .

PROBLEM: In old books , the pages are often made of animal skin instead of film .

SOLUTION:
In old books, the pages are often made of animal skin instead of paper.