1. Adverb: This is the most common use of "well". It describes how something is done.
* "She sings well."
* "The team played well."
2. Interjection: This is used to express agreement, surprise, or other emotions.
* "Well, I'm glad you're here."
* "Well, that's interesting!"
3. Adjective: This is less common but can be used to describe someone's health or something's condition.
* "She's well again."
* "The project is well underway."
4. Noun: This is very rare, but it can refer to a well (a hole in the ground for water).
* "We drew water from the well."
To determine the part of speech, consider the sentence structure and the meaning.