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Tá céist bheag a'm. Bhí mé ag léamh Buntús Caint aríst agus chonaic mé na focail/frásaí "ar feadh" agus "go ceann". Are these interchangable or are they set in certain contexts? That is can I say "Seas abhus anseo ar feadh nóimead" as well as "Seas abhus anseo go ceann nóimead" ?

GRMA.

Ar feadh can be used for a period in the past, present or future, including one beginning in the past and ending in the future.

Go ceann refers specifically to a period starting "now". Go means "to, until", and ceann means end.

Similarly, le ... (anuas) refers specifically to a period until "now".

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).

go raibh maith agat Breandán