verb
a word used to describe an action, state, or occurrence, such as 'speaking'
preposition
a word that shows the relationship between a noun or pronoun and other words in a sentence, such as 'of'
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Speaking of upcoming events, have you finalized the agenda for the conference?
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Speaking of movies, have you seen the latest blockbuster yet?
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Speaking of cool gadgets, did you check out that new phone?
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Speaking of reaching new heights, our sales have been soaring this quarter.