Interjections are typically divided into three categories: emotive, volitive, and cognitive.
1. Emotive – express the feelings of a speaker, like anger, fear, surprise, and disgust (“Rats!”, or “Oh!”, or “Huh?”, or “Blech!”, respectively),
2. Cognitive – express the understanding of information by the speaker, or internal reaction to information (“Ohh”, “I see”, “Aha!”, and “Wow”), and
3. Volitive – are used as imperative or directive speech, meant to instruct or command others to do something (“Look!”, “Listen”, “Shh!”, “Look out!”).