TASK DEFINITION: Given a disfluent sentence, modify the sentence to it to its equivalent fluent form, preserving the meaning of the sentence.
PROBLEM: Which modern city did Hebei or no make that Khanbaliq become?

SOLUTION: What modern city did Khanbaliq become?

PROBLEM: How many er which plateau is the left part of Vistula on?

SOLUTION: Which plateau is the left part of Vistula on?

PROBLEM: What path changes the force umm rather direction of an object?

SOLUTION:
What path changes the direction of an object?