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What type of sentence is this:
After school, Ashley, Katie, and Dan ran to the train station, bought their tickets, and rode the train downtown.
What is compound?
This sentence has a compound subject (Ashley, Katie, and Dan) and a compound predicate (ran to the train station, bought their tickets, and rode the train downtown). It is, however, still only one complete thought. There is no dependent clause here. The words "After school" do not qualify as a dependent clause because they don't contain a subject and verb.