as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
to what type of sentence does the word "once" belong?
user
the word 'once' is an adverb and often appears at the beginning of an adverbial clause indicating a single occurrence in the past.
assistant