* Adverb: This is the most common usage. It modifies verbs, adjectives, or other adverbs to indicate duration or frequency.
* Determiner: "Ever" can be used with singular nouns to indicate any time, or all times, in the past, present, or future.
* Pronoun: In rare cases, "ever" can act as a pronoun, replacing a noun phrase that refers to a time.
Here are some examples:
* Adverb: "Have you ever been to France?" (modifies the verb "been")
* Determiner: "Have you ever seen such a beautiful sunset?" (modifies the noun "sunset")
* Pronoun: "Since ever has she shown such kindness?" (replaces "since that time")
It's important to look at the context of the sentence to determine the specific part of speech.