Breakdown of Куда вы поедете летом?
вы
you (plural)
куда
where to
летом
in summer
поехать
to go (by transport)
Questions & Answers about Куда вы поедете летом?
Why is it Куда and not Где for "where"?
Где means "where at" (describing a static location), but куда means "where to" (describing the direction of motion). Since you are asking about someone's travel destination, you must use куда.
Why use поедете instead of пойдёте for "will go"?
Both mean "will go," but поедете is specifically for trips made by transport (driving, flying, taking a train). Since a summer vacation usually involves traveling a long distance, Russian assumes you are using a vehicle. Пойдёте is strictly for going on foot.
Does the по- in поедете have anything to do with the preposition по (by means of) from this lesson?
No, in this case по- is a verb prefix, not a separate preposition. Adding the по- prefix to the motion verb едете (you are going) creates a perfective verb, which shifts the meaning to the future tense: "you will go" or "you will set off."
Why is "in the summer" translated as just one word, летом?
In Russian, you don't use a preposition like "in" for seasons. Instead, you take the noun лето (summer) and put it in the Instrumental case. Changing the ending to -ом (летом) automatically means "in the summer" or "during the summer."