Detailed Instructions: 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.
Q: They were being sought for interviews just because they were literally in the area after the homicide, he said. FBI officials said they (were) not certain whether Stauber or Gingrich had been involved in antiabortion activities.
Verb: were
A:
Yes