Definition:
'never' is used as an exclamation that expresses disbelief or disapproval.
Rules:
'never' is usually used to express a strong negative sentiment, such as disbelief, disbelief at the absurdity of something, or distaste. It can be used as both an interjection and an emphatic adverb.
Examples:
1. 'I can’t believe I said that - never!'
2. 'He said he would never do it, and now he’s changed his mind!'
3. 'You’d never guess what happened to her!'
Tips:
be careful when using 'never' as it can come off as overly negative or dismissive. It is better to use a softer word, such as 'rarely' or 'seldom,' if you do not wish to be too extreme in your expression.