The present perfect is 'I have sung'
I/you/we/they have sung. He/she/it has sung.
The past perfect tense is had sung.
I/You/We/They sing. He/She/It sings. The present participle is singing.
Sing
"Has been singing" is in the present perfect progressive tense. "Is singing" is the present progressive tense.
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.
Have /has sung He has sung his last song. They have sung all the songs
Present tense - singing Past participle - sung
I/you/we/they have sung. He/she/it has sung.
I sang I have sung is the present perfect tense. You would not say, "I sung the song well."
has been sung / have been sung. All the songs have been sung. The song has been sung
Sing is the present tense of sang.
The future perfect tense of sing is "will have sung."
It is "had sung".
Present tense
The present perfect tense is Have/Has Hidden.
The present perfect tense is has/have existed.