✔ 最佳答案
After---preposition
hearing-----verbal noun as object
me----indirect object as pronoun
sing-----object as present tense infinitive as object complement
(not my singing-----verbal noun;too much verbal noun;
--to sing----infinitive case;not direct object, or object complement)
eg:-After hearing me sing , her hearing impaired seriously !!!!!
------She was not able to hear well ,having an earache !!!!!