TASK DEFINITION: Given a disfluent sentence, modify the sentence to it to its equivalent fluent form, preserving the meaning of the sentence.
PROBLEM: Who wrote Freakonomics and is also a physicist no an anthropologist?

SOLUTION: Who wrote Freakonomics and is also an anthropologist?

PROBLEM: What can or no make that where can a tribute to the fall of Katyn be found?

SOLUTION: Where can a tribute to the fall of Katyn be found?

PROBLEM: Which effect or no rather what effect does trade with poorer countries have on the workers in poorer countries?

SOLUTION:
What effect does trade with poorer countries have on the workers in poorer countries?