"Has been singing" is in the present perfect progressive tense. "Is singing" is the present progressive tense.
I/You/We/They sing. He/She/It sings. The present participle is singing.
The present perfect is 'I have sung'
Sing
Present: Singing Past: Sung
Present progressive is 'singing'.
The future progressive tense of "sing" is "will be singing."
The future progressive tense of "sing" is "will be singing."
present progressive of search
The present progressive of "laugh" is "laughing."
The present progressive of "awake" is "awaking" or "awakening."
Present progressive, past progressive, and future progressive
The present progressive tense of withdraw is:I am withdrawing.You/We/They are withdrawing.He/She/It is withdrawing.
The present progressive tense of "want" is "wanting."
The present progressive tense of "hold" is "holding."
The present progressive form of "ring" is "ringing." For example, "I am ringing the doorbell."
"Becoming present" is in the present progressive tense. It is used to describe an action that is currently happening or in progress.