Instructions: From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.
Input: Given Relationship: 'revert to', Sentence: 'Ever since Hong Kong reverted to China 's sovereignty in 1997 , the CCP has been hoping to use it as a showcase to convince the Taiwanese people to accept the "one country , two systems " model .'
Output:
reverted