vy jste

In Czech culture, vykání is essential for showing respect and maintaining social distance. It is the default register for anyone you don't know well, service workers, and superiors.

To use it, you conjugate the finite verb in the second-person plural (the "you all" form). For example, using the present tense of být, you say vy jste (you are). The pronoun vy is usually dropped unless you want to emphasize it. You must also switch the possessive pronoun from the informal tvůj to the formal váš (e.g., To je váš stůl?). Similarly, you must switch personal object pronouns from the informal tě/ti to the formal vás/vám. For example, say Dám vám to (I will give it to you) instead of Dám ti to, and Rád vás poznávám (Nice to meet you) instead of tě.

Greetings:
When using formal address, you must strictly pair it with formal greetings like Dobrý den and Na shledanou. A classic beginner mistake is mixing registers by using informal greetings like Ahoj or Čau with formal verbs.

The Rule of Split Agreement:
The most important rule for beginners to learn is that when addressing a single person formally, only the finite verb becomes plural. Everything else describing the person stays singular and matches their natural gender:

• Nouns: Vy jste pan Novák? (Are you Mr. Novák?)
• Adjectives: Jste unavená? (Are you tired? [to a woman])
• Past Tense: Byl jste tam? (Were you there? [to a man])
• Conditional Mood: The auxiliary verb is byste (never by jste), paired with a singular past participle: Chtěl byste...? (Would you like...? [to a man]).

Commands (Imperative):
When giving commands or making requests, you must use the formal imperative. This is a core area where beginners accidentally slip into informal speech. Always say Prosím, počkejte (Please wait) instead of počkej, or Promiňte instead of promiň.

Reflexive Pronouns:
Reflexive pronouns (se and si) do not change in formal address, but the verb still takes the formal 'vy' conjugation. For example, you say Posaďte se (Sit down) instead of Posaď se. However, in the past tense, you must be careful. The informal merged forms ses and sis must be split back into jste se and jste si. For example, change Jak ses měl? to Jak jste se měl? (How were you?), and Koupil sis to? to Koupil jste si to? (Did you buy it?).

Addressing Groups:
When addressing multiple people, the distinction between formal and informal disappears. You simply use the standard plural for everything: Byli jste tam? (Were you all there?).

Direct Address:
When addressing someone directly using vykání, you typically use the singular vocative case with their title or last name (e.g., Dobrý den, pane Nováku, not pan Novák). However, in modern workplaces or among acquaintances, a common 'half-step' is vykání křestním jménem, where you use formal verbs but address the person by their first name (e.g., Dobrý den, Petře).

Formal Writing:
In formal written correspondence, such as emails or letters, it is a strict rule to capitalize the formal pronoun and its derivatives (Vy, Vám, Vás, Váš) as a sign of respect.

Cultural Note:
Never unilaterally switch to the informal ty. The transition from formal to informal must be explicitly negotiated. Etiquette dictates that the older person, the more senior person at work, or the woman (when speaking to a man of similar age and status) must be the one to suggest it, often by asking Můžeme si tykat? (Can we use 'ty'?).