Didn't sing.
The present perfect is 'I have sung'
I/you/we/they have sung. He/she/it has sung.
Song is a noun and doesn't have a past participle. Verbs have past participles. Sing is a verb the past participle of sing is sung. sing / sang / sung He has sung this song hundreds of times.
"Has been singing" is in the present perfect progressive tense. "Is singing" is the present progressive tense.
The past perfect tense of "sing" is "had sung."
The present perfect tense with the past participle of "sing" is "have sung."
The present perfect tense of sang is have sung.
I sang I have sung is the present perfect tense. You would not say, "I sung the song well."
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.
Present Continuous: They are singing.Past Continuous: They were singing.Unless you want the past tense of the word "sing," in which case:Simple Past: They sang.Past Perfect: They had sung.
The past tense of "exist" is "existed." The past perfect tense is "had existed."
The past tense of "sing" would be "sang" or "sung".
The future perfect tense of sing is "will have sung."
The past tense of sit is sat. The past perfect tense of sit is had sat.
The past tense of "bleed" is "bled." The past perfect tense of "bleed" is "had bled."
The past perfect tense is had set.