Questions & Answers about Dlaczego jedziesz bardzo wolno?
Why do we use jedziesz here instead of idziesz?
jedziesz comes from the verb jechać, which means to go by vehicle (like driving a car, riding a bike, or taking a train). If the person were walking or going on foot, you would use idziesz (from iść).
Can jedziesz only mean "driving"?
No, it covers almost any type of travel using a vehicle! While it translates to "driving" in this English sentence, jedziesz just means you are moving via transport. It applies whether you are the driver of a car, riding a bicycle, or just sitting as a passenger on a bus.
How do we know it means "you are driving" if the word for "you" isn't in the sentence?
The verb ending tells you who is doing the action. The -sz ending on jedziesz is the "you" (singular, informal) form. Because the ending makes it obvious, Polish speakers usually drop the pronoun ty (you).