Interjections can be formal and informal! What is an interjection? An interjection is a word, phrase or clause that shares a persons feelings or emotions! That’s just the start! Interjections are used everyday in formal and informal English. Interjections sometimes have a clear definition or no definition. Any word in the English language can be used as an interjection. While interjections are considered as one of the eight, nine or ten essential parts of English, they are not essential at all! Interjections can be used to compliment a fact or thought! They are also used alone without further explanation. Remember, a complete sentence in English must contain at least one verb!