You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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.

Only the government of the United States can decide if it prefers this variant, continued the letter, which Castro read on a state television station broadcast. Gonzalez for months refused requests by Elian's Miami relatives to go to the United States to (claim) the boy.  
 Verb: claim
Solution: Yes
Why? This is a good example. Gonzalez refused to "claim" the boy. So, the claim didn't happen and it's a negation.

New input: If and when the relatives' appeal goes to federal court, chances of a favorable ruling are slim. First of all, the INS already has taken the position the only person who can petition for U.S. asylum for Elian is his father, which he is not about to (do).  
 Verb: do
Solution:
Yes