* Verbs have tense, mood, and aspect.
* Adjectives agree in gender and number with the nouns they modify.
* Word order is relatively free, but certain patterns are preferred.
* Celtic languages use a variety of grammatical particles to express various meanings.
Here are some examples of Celtic languages:
* Irish (Gaeilge) is spoken in Ireland and Northern Ireland.
* Scottish Gaelic (Gàidhlig) is spoken in Scotland.
* Manx (Gaelg) is spoken on the Isle of Man.
* Welsh (Cymraeg) is spoken in Wales.
* Breton (Brezhoneg) is spoken in Brittany, France.
* Cornish (Kernowek) is spoken in Cornwall, England.