Is this right?
I found this in a grammar book: Is féidir liom é a dhéanamh. I can do it
But shouldn't this be, Is féidir liom á dhéanamh because á is used for it when it is the object of a verbal noun.
If i'm wrong, could you please tell me why this rule doesn't work in this example. Thanks
The grammar book is right. You can't use the ag VN structure directly following Is X liom so you have to use the infinitival structure instead.
I hope that made enough sense. Just let me know if it didn't, and I'll work on it when I get home.
Síleann mé go thuigeann mé, ach cad é an t-ainm atá ar an struchtúr sin - is x liom. Agus an bhfuil sé an riail céanna don cineál struchtúir sin i gconaí?
An raibh mo Ghaeilge ceart?
Oh, you're definitely right. No harm in trying! In fact, trying and getting corrections is the only way to improve.
Can I ask how you're supposed to know when to use the copula like I failed to do above? Are you connecting the same rule and that kind of structure or something? I don't understand.
You're connecting "it" and "the same rule". Basically, if you connect a pronoun/noun and a noun, you use the copula (unless you wish to use the bí i phrasal verb, which does have a slightly different meaning)
> Síleann mé go thuigeann mé
Sílim go dtuigim.
> Agus an bhfuil sé an riail céanna
Tá sé fear alert! An é an riail chéanna é le haghaidh an cineál struchtrúir sin i gcónaí. I really don't like do used as 'for' there. And riail is feminine.
> An raibh mo Ghaeilge ceart?
An raibh mo chuid Gaeilge (i g)ceart? I figure i gceart would be more common among native speakers, and is suggested in FGB.
But, to answer your question:
It really just depends on the word with the copula. Some use le, some use do (such as: Is éigean dhom or ba chóir dhom), and I'm sure there's probably some that use other prepositions.