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: Tuesday to sign a paper promising to turn over the boy to immigration authorities if they lose their federal court appeal. The Miami relatives thus far have (refused) to sign the document, and in recent days said they would not turn Elian over to his father if he came to the United States.
Verb: refused

SOLUTION: Yes

PROBLEM: WARSAW, Poland ( AP ) _ Poland, Hungary and the Czech Republic can now (participate) in NATO strategy planning, because all NATO member states have approved their joining the alliance, German defense minister Rudolf Scharping said Saturday.
Verb: participate

SOLUTION: No

PROBLEM: He insisted that the NGO law " will not change our position at all ". " We wo n't refuse foreign donations, nor will we (register) as a'foreign agent', " he said.
Verb: register

SOLUTION:
Yes