TASK DEFINITION: Given a disfluent sentence, modify the sentence to it to its equivalent fluent form, preserving the meaning of the sentence.
PROBLEM: When did no no didn't British begin to build fort under William Trent?

SOLUTION: When didn't British begin to build fort under William Trent?

PROBLEM: What is the name of a prime number, oops my bad, an algebraic structure in which addition, subtraction and multiplication are defined?

SOLUTION: What is the name of an algebraic structure in which addition, subtraction and multiplication are defined?

PROBLEM: Why has Warsaw, uh wait, what suffered considerably for Bloc when it had an Eastern economy?

SOLUTION:
What suffered considerably for Bloc when it had an Eastern economy?