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: Global lead equals global proportion .

SOLUTION: Global humidity equals global warming .

PROBLEM: A teacher can ask whether a student know the answer to a question.

SOLUTION: A body can ask whether a student know the answer to a question .

PROBLEM: A portal is made up of 350 pages .

SOLUTION:
A main is made up of multiple pages .