"All" can act as:
* An adjective: When it modifies a noun, describing how much or how many.
* Example: "All the students were excited for the trip." (Here, "all" modifies "students")
* A pronoun: When it stands in for a noun, referring to a whole group or amount.
* Example: "All is forgiven." (Here, "all" refers to everything)
* A determiner: When it precedes a noun to specify the quantity.
* Example: "All children deserve love." (Here, "all" specifies that the noun "children" is a complete group)
Therefore, "all" is not inherently an adjective. Its grammatical function depends on the context of the sentence.