The word ‘well’ can function as different parts of speech depending on its usage in a sentence. Primarily, it serves as an adverb, an adjective, and, in some contexts, as a noun.
1. **As an Adverb:** The most common use of ‘well’ is as an adverb. For instance, in the sentence ‘She sings well,’ ‘well’ modifies the verb ‘sings’ and describes how she sings.
2. **As an Adjective:** ‘Well’ can also act as an adjective, particularly when describing someone’s health, as in ‘I hope you are well.’ Here, ‘well’ is used to describe the state of being healthy.
3. **As a Noun:** In certain contexts, ‘well’ can function as a noun, such as in the phrase ‘He fell into the well.’ In this case, ‘well’ refers to a deep hole or shaft.
So, in summary, ‘well’ is versatile and can be classified as an adverb, an adjective, or a noun depending on how it is used in a sentence.