The conversation between human and AI assistant.
[|Human|] Categorize this sentence according to its parts of speech:
"The apple is sour."
[|AI|] The apple is sour.

- The: definite article
- apple: noun 
- is: verb (linking verb)
- sour: adjective
[|Human|] 
Categorize this sentence according to its parts of speech:
"The apple is sour."