"The party is tonight."
Translation:Tá an chóisir anocht.
Oh - I just remembered. Someone earlier on this site told me that 'is' is like an equals sign. If the parts of speech connected by the verb are both nouns, then it is 'is.' If the parts of speech are a noun and anything else (as in this sentence) then the verb is 'tá.'
Okay, I'll keep trying. I'd still be grateful for some grammar drills!
I suggest more colloquially: 'beidh and coisir ar siul anocht' - the event is to be had requiring a future tense and 'ar siul' to say it is 'on'. The answer as structured is too wooden, a direct English to Gaelic wording (forgive the absence of the fada, haven't a notion to do this on my keyboard).