In terms of their phonology, English interjections are typically separated from the surrounding discourses by pauses, and they can contain sounds not otherwise found in English. English interjections tend not to take inflectional or derivational morphemes. In terms of their syntax, they tend not to form constituents with other words and are parenthetical rather than integrated into the clauses in which they occur. Semantically, they often have emotive or interpersonal meanings and their use is sometimes called exclamatory. English interjections fill several pragmatic roles in English, including greeting and indicating agreement.
