Noun or adjective

Ainmear no Buadhair

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!