It’s important to learn word types and understand how different words work in a sentence. The word types we often see with faireachdainn are ainmearan (nouns) and buadhairean (adjectives).
with nouns + air/aig + air
A bheil teagamh orra?
Are they uncertain?
Bha gràin aice air a’ bhùth sin!
She hated that shop!
with adjectives and the verb bi:
Nach eil iad teagmhach?
Aren’t they dubious/doubtful?
Cha robh sinn iomagaineach idir!
We weren’t anxious at all!