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: A blanket can be covering a bed.

SOLUTION: A Man can be washing a bed .

PROBLEM: You are likely to find a float around in a plate .

SOLUTION: You are likely to find a knife right in a plate .

PROBLEM: A pen is a sharp tube filled with ivory , that makes marks on paper .

SOLUTION:
A pen is a narrow tube filled with ink, that makes marks on paper.