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: Kopp has eluded authorities since they obtained a warrant for him as a material witness in the Oct. 23 sniper shooting of Dr. Barnett Slepian, a 52-year-old obstetrician-gynecologist who performed abortions. The search for Kopp was recently (extended) to Mexico.
Verb: extended

SOLUTION: No

PROBLEM: A new ABC News-Washington Post opinion poll shows that 6 of 10 Americans also believe the boy should go home with his father. But in Miami, Cuban exiles insist the majority of Americans do n't (understand) the dynamics of life in Cuba.
Verb: understand

SOLUTION: Yes

PROBLEM: Dealers placed heavy buy orders in the morning to start the first trading day for November transactions. But they (failed) to sell these stocks to client investors, who were cautious about the sharp gains these issues made this week, the Wako official said.
Verb: failed

SOLUTION:
Yes