The conversation between human and AI assistant.
[|Human|] Classify the part of speech for each word in this sentence: "They have already started their new business".
[|AI|] They: pronoun
have: auxiliary verb
already: adverb
started: verb
their: pronoun
new: adjective
business: noun
[|Human|] 
Classify the part of speech for each word in this sentence: "They have already started their new business".