An Interjection is a word used to express some sudden feeling or emotion.
"Alas" and "Hurrah" are "interjections" in these sentences.
Properly speaking, it is not a part of speech, for it is not grammatically related to any other word or words in the sentence. It does not express a thought. It is merely an exclamatory sound thrown in to a sentence to express some strong feeling or emotion.
The following is a list of the most common Interjections:
Certain groups of words or phrases are also used to express sudden feelings or emotions.
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