Size and semantic confines of interjections’ category

The paper considered an issue of a certain category the interjections pertain to, of their size and semantic confines. In Tatar language interjections exist as a specific category of words that has no nominative function. In English interjections are isolated being a separate part of speech. Analyzing this issue, you can find a lot of opinions linguists are divided in, with multiple interpretations of this issue.