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An bhfuil ann faoi leith riail ar tuiseal ginideach ar gach focal?

An bhfuil ann faoi leith riail ar tuiseal ginideach ar gach focal? --> Tá bron orm. That's the best I could come up with. What I really wanted to say is:
Is there a particular rule on how to transform a word to its genitive case?

I can hardly see a pattern (if there's any). All I do is to memorize. :(

For learning: Gaelic (Irish)
Base language: Gaelic (Irish)
Category: Language



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    An bhfuil riail faoi leith ann chun gach focal a chur sa tuiseal ginideach?
    Tá. Tá cúig riail (ar a laghad!).

    Nouns in Irish are divided into 5 groups, or declensions, according to how they form the genitive case.

    - Declension 1: consists of masculine nouns ending in a broad consonant, they form their genitive by slenderising the final consonant, usually by adding an "i" before it, e.g. cat > cait; leabhar > leabhair; fear > fir (includes all nouns ending in "-án").

    - Declension 2: mostly feminine nouns (except "im" and "sliabh", which are masculine) ending in a consonant, they form the genitive by adding a final "-e" and slenderising a preceding consonant where necessary, e.g. fuaim > fuaime; cáis > cáise; fuinneog > fuinneoige; ciall > céille (includes all nouns ending in "-óg", "-eog", "-lann").

    - Declension 3: masculine or feminine nouns ending in a consonant which form their genitive by adding "-a" and broadening the final consonant where necessary, e.g. gleann > gleanna; dochtúir > dochtúra; beannacht > beannachta (includes nouns ending in "-acht", "-éir", "-óir", "-úir", "-áil").

    - Declension 4: nouns ending in "-ín" or in a vowel, and a few others, they don-t change in the genitive, e.g. muinín > muinín; file > file; ainmhí > ainmhí; baile > baile.

    - Declension 5: nouns ending in a slender consonant or a vowel, the genitive case ends in a broad consonant but there are many different ways of forming it, e.g. "-ach": cáin > cánach; cathair > cathrach; riail > rialach
    "-n": ceathrú > ceathrún; comharsa > comharsan; monarcha > monarchan
    "-d": fiche > fichead; cara > carad
    broadening: athair > athar; máthair > máthar; abhainn > abhann; namhaid > namhad; Nollaig > Nollag

    Then there are also some irregular nouns which form their genitive case in other ways: deoch > dí; teach > tí; lá > lae; leaba > leapa; mí > míosa; bean > mná.

    As you can see, it's very simple;)

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