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sing, sang/sung, sung
present tense, past tense, past participle used with the perfect tenses
(tiempo presente, tiempo pretérito simple, participio pasado (or pasivo) usado para formar los tiempos compuestos)
He sings.
He sang.
He has sung.
@conejodescarado: Sung is not an adverb. In the sentence you listed it as such, sung is a past participle used with the 'to be' verb to form the passive voice.
It is sung. (The agent, the person who sang the song, wasn't mentioned.)
The song was sung. (Again, no agent was mentioned.)
The song was sung well. (Adverb added, but still no mention of the agent.)
The song was sung well by the vocalist. (Agent mentioned.)
The vocalist sang the song well. (Active voice, past tense.)
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