English still feels hard to explain when things sound natural and when they don't.
You can say "there are some vendors in the street" and it sounds normal. But if you were to say "they are some vendors" it sounds weird. It's pretty firmly more natural to say "they are vendors."
You can say "there are some vendors in the street" and it sounds normal. But if you were to say "they are some vendors" it sounds weird. It's pretty firmly more natural to say "they are vendors."