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: He persevered through courage and a belief in the right of his patients to choose whether to bear a child. But a principled commitment to provide a constitutionally protected service could not (stop) the assassin's bullet that tore through his kitchen window and into his back Friday night.
Verb: stop

SOLUTION: Yes

PROBLEM: Slepian, a 52-year-old obstetrician and gynecologist who was the mainstay of Buffalo's only abortion clinic, was shot to death on the night of Oct. 23 as he stood in the kitchen of his home in suburban Amherst, N.Y. chatting with his wife and one of his four sons. No weapon was (recovered) in the first police searches of the area around Slepian's home.
Verb: recovered

SOLUTION: Yes

PROBLEM: Three times, doctors whose names appeared on the list were killed, most recently last October when Dr. Barnett Slepian was gunned down by sniper fire in his home outside Buffalo, N.Y. His name on the Web site was crossed out that same day. Pathway Communications, which has (maintained) the site, said in a statement that The Nuremberg Files was knocked off-line without notice.
Verb: maintained

SOLUTION:
No