Interjections (izsauksmes vārdi) express feelings or reactions. They stand apart from the grammar of the sentence and are usually followed by an exclamation mark.
Ak!
Oh!
Ai!
Ouch! / Oh!
Oho!
Wow!
Urā!
Hurray!
Ē!
Hey!
Fui!
Yuck!
Ak, cik skaisti!
Oh, how beautiful!