Question

Why do some languages have formal and informal "you"?

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Answer

Because many languages grammaticalise social relationship into the pronoun system — a distinction English once had and lost, which is why English speakers find the choice uncomfortable rather than automatic.

What the distinction encodes. Linguists label it the T-V distinction, after Latin tu and vos. The informal form is used with family, friends, children and social equals in casual contexts; the formal with strangers, elders, superiors and in professional settings. Which applies depends on relative status, social distance and setting — and the norms differ sharply between languages that appear to have the same system.

How it arose. The usual account traces it to the use of plural forms as a mark of deference to a single powerful person, spreading downward through society as a marker of politeness.

English used to have it. Thou was the singular familiar form and you the plural and formal one. Thou did not disappear because it was rude; it disappeared because the polite form expanded to cover everyone — which is why archaic thou now sounds elevated in religious texts while it was originally the intimate form. English is unusual in having lost the distinction entirely.

Why it is genuinely difficult for learners. Getting it wrong is not a grammatical error but a social one, which is more embarrassing and less forgivable. Learners are frequently told a simple rule that does not match real usage.

The norms vary enormously. Some languages have moved sharply towards informality in recent decades, with workplaces and advertising adopting the familiar form. Others retain strong formality. Some have a third layer, or elaborate honorific systems extending far beyond pronouns into verb forms and vocabulary.

The transition is socially significant. In several languages there is a moment — sometimes explicitly proposed — where two people agree to switch to the informal form, and it marks a real change in relationship.

What English does instead: encodes the same information through titles, names, hedging and register, which is less visible and no less present.

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