Learn Hardcore Russian: Вы можете задать вопрос менеджеру после семинара. - You can ask a question of the manager after the seminar.

In Russian, Вы is the formal “you” (also the plural “you”) and shows respect or distance. You would use ты only in informal settings (friends, family). In business or polite contexts you choose Вы. In writing, especially letters or announcements, Вы is often capitalized to emphasize courtesy. In everyday typed Russian you might also see the lowercase вы.

What does можете mean and how does it function in this sentence?

можете is the 2nd person plural (or polite singular) present form of the verb мочь (“to be able to,” “can”). Here it acts like a modal verb: Вы можете = “You can” or “You are able to.” It pairs with the infinitive задать to express permission or ability.

Why is вопрос in the accusative case and менеджеру in the dative case?

вопрос is the direct object of задать (“to pose/submit”), so it takes the accusative case. Since вопрос is a masculine inanimate noun, its accusative looks like nominative.
менеджеру is the indirect object (“to the manager”) answering the question кому? (“to whom?”). After задать вопрос you use the dative case for the person.

What case does после require, and why is семинара in the genitive?