Ba maith liom siúcra i mo chaife
Having a lot of trouble with "I want"/"I need" forms. Does the above sentence sound correct/is there a better way to say it?
The word that follows ba is lenited, so it’d be Ba mhaith liom … rather than Ba maith liom … . This conditional form is polite, akin to “I’d like …” in English, so it’s fine to use.
This does not really translate to I want/need. It is more accurately I would like with the sentence above being I would like sugar in my coffee
Which phrase you use depends entirely on what message you are trying send. If you're trying to say "I want (expletive deleted) sugar in my coffee, and I want it now!" you'd use a different construction than if you wanted to say "I want sugar in my coffee because my blood sugar is a bit low", or "I'll be back in a minute - I just want to get some sugar in my coffee".
98% of the time when someone asks "Do you want sugar in your coffee?", the best translation would be "Ar mhaith leat siúcra i do chaife?", which would usually translate back as "Would you like sugar in your coffee?"