TASK DEFINITION: You will be given a context and a verb separated with a newline character, and you have to answer if the given verb is a negation or not. A verb is a negation if it is not going to exist, not happen, or has no effect. The output should be "Yes" if the verb is a negation and "No" otherwise.
PROBLEM: Iraq is believed to have the ability to deliver chemical weapons in artillery shells or, perhaps, atop Soviet-made Frog7 missiles. Perhaps more important, it appears that allied troops have n't yet fully (engaged) Iraq's vaunted Republican Guard, which has been sitting just north of the Iraq-Kuwait border and is considered the most potent element in the Iraqi defense.
Verb: engaged

SOLUTION: Yes

PROBLEM: " In some industries, like pharmaceuticals, acquisitions make sense. " Whether Polly Peck's acquisition makes sense remains to be (seen), but at the news conference, Mr. Nadir brimmed with self-confidence that he can turn Sansui around.
Verb: seen

SOLUTION: Yes

PROBLEM: Elian's mother and 10 others died, but the boy survived by clinging to an inner tube. Elian's Miami relatives took in the child, but then refused to (return) him to his surviving father in Cuba, citing the harshness of the Castro regime.
Verb: return

SOLUTION:
Yes