Which of the verb tenses of the word 'sing' appropriately completes the sentence:
She said that she heard Esther ______.
In my study of the concept of reported speech I got to understand that a statement of this nature, when reported, carries past tense of the verb. But still after checking with online grammar software I am tempted to believe that the verb tenses 'sing', 'sang' and 'sung' can all appropriately complete the sentence. This of course is the root of my confusion.