General characteristics:
* Exclamations: Interjections are often used to express strong emotions or sudden feelings.
* Non-grammatical: Interjections are typically not part of the grammatical structure of a sentence.
* Independent: They can stand alone as a complete utterance, although they can also be used within a sentence.
* Emotional expression: Their primary function is to express emotions like surprise, joy, pain, anger, disgust, etc.
Specific types of interjections:
* Greetings: *Hello*, *goodbye*, *hi*
* Responses: *Yes*, *no*, *okay*
* Emphasis: *Wow*, *oh*, *my goodness*
* Sudden emotions: *Ouch*, *yuck*, *phew*, *oops*
* Commands: *Stop it*, *look out*, *hurry up*
Other related terms:
* Exclamation mark (!): This punctuation mark is commonly used after interjections.
* Intensifiers: *Oh my goodness*, *Gosh*, *Wow!*
* Idioms: Some interjections are part of common idioms, like *good grief*, *oh well*, *for goodness sake*.
It's important to remember that the boundary between interjections and other parts of speech can sometimes be blurry, especially in informal language. For example, words like *hey* or *well* can function as both interjections and adverbs depending on the context.