Present perfect.
I/you/we/they have sung. He/she/it has sung.
Sing
Sang
The past perfect tense is had sung.
The present perfect is 'I have sung'
The future perfect tense of sing is "will have sung."
The past perfect tense of "sing" is "had sung."
Sang is the past tense of sing. The present perfect tense of sing is I/We/You/They had sung; He/She/It has sung.
The present perfect tense of "sing" is "have sung" or "has sung."
Sing is present tense, sang is past tense, and sung is the past participle.
sang, not sung. "I sang a song" is correct, but "I sung a song" is not. You would say "I have sung a song", which is present perfect tense.
past tense
The perfect tense is used to describe actions that were completed in the past or continued from the past into the present. It is formed with the auxiliary verb "have" (or "has") and the past participle of the main verb.
I sang I have sung is the present perfect tense. You would not say, "I sung the song well."
The past tense of "indicate" is "indicated."
The present perfect tense of "sing" in passive voice is "has been sung."
I/you/we/they have sung. He/she/it has sung.