Does this exist in the Irish language?
For example
Have you(plural) forgotten about...?

You'd either say : An dtearr tú dearmad ar...?
or : Bhfuil dearmad déanta agad ar...?

But it doesn't work with all verbs. Btw, many languages don't make a distinction between "I have done" and "I did".

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

Basically Irish doesn’t differentiate between the English preterite and perfect tenses.

Have you forgotten about..?
Did you forget about…?

would both be (in the CO)

An ndéarna sibh dearmad ar….?

There is a construction that resembles the English perfect but it has a slightly different meaning in Irish. It is used for something that has been completed in the present, (this is the same usage of the perfect as in French, and, I think, as in German.)

Tá dearmad déanta agam ar...
I have (finally) forgotten about....

Hope I made this a little bit understandable

I suppose you could say

Táim tar éis dearmad a dhéanamh ar... if you want to talk about something you have just recently forgot, or just realising/acknowledging you have come to forget something.

There are two kinds of perfect in Irish:

• a resultative perfect: the "have perfect".
  Special emphasis is placed on the result of an action.
  Tá dearmad déanta agam air -> Bullox, I've forgotten it. I can't remember.
• a terminative perfect: the "after perfect".
  Special emphasis is placed on immediate termination of an action.
  That is what you mean.
  Tá mé tar éis dearmad a dhéanamh air -> Oh, only two minutes ago I could remember but ... oops ... just now I've forgotten it.

I don't know about French, but in German, there is no real distinction between perfect and preterite (imperfect) anymore. Both mean the same. Perfect is colloquial, preterite is formal.
Ich hab's vergessen. / Ich vergaß es.

In French you don't differentiate either. That's why it's hard to native French speakers like me to master the difference, in English, between things like "I did" and "I have done". In everyday French, we say "j'ai fait" (which corresponds word for word to "I have done") and it means both "I did" and "I have done"...

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

There are different types of aspect -some are for the time of the event:

about to start
at the point of starting
just after starting
in the middle of ['running']
about to end
at the point of ending
just after ending

has ended


Some are cognitive or perceptive and are less easy to spot:
twinkling
pulsing
blaring


There are more again, as aspect is a complex field

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An bhfuil..... dearmaidthe (sp?) agaibh?


I have no idea what grammatical tense that is though.

Goidé mar a fhuaimneas tú 'n aidiacht bhriathartha sin ? dearmata? dearmadaí? dearmataí? Gheobhaidh muid an litriú is fóirsteanaí má mhíneann tú 'n fuaimniú domh

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

Present tense, perfective aspect, I guess

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__̴ı̴̴̡̡̡ ̡͌l̡̡̡ ̡͌l̡*̡̡ ̴̡ı̴̴̡ ̡̡͡|̲̲̲͡͡͡ ̲▫̲͡ ̲̲̲͡͡π̲̲͡͡ ̲̲͡▫̲̲͡͡ ̲|̡̡̡ ̡ ̴̡ı̴̡̡ ̡͌l̡̡̡̡.___