Learn French: Recevez-vous beaucoup de messages ? - Do you receive a lot of messages?

Reversing the verb and the subject pronoun is called inversion. It is just another way to ask a question, but it sounds more formal than using est-ce que or simply raising your voice at the end of a sentence. You will see this a lot in writing or polite professional speech.

Do I always need to use a hyphen in these formal questions?

Yes! Whenever you swap a verb and a subject pronoun to make a question, you must connect them with a hyphen. If you forget the hyphen in words like Recevez-vous, it is considered a spelling mistake.

Since messages is plural, why isn't it beaucoup des messages?

This is a very common trap! After expressions of quantity like beaucoup (a lot), un peu (a little), or combien (how many), you always use de or d'. You never use des, even if the noun that follows is plural.

How do you pronounce the plural word messages?

It sounds exactly like the singular word message. In French, the letter s at the end of plural nouns is almost always silent.