Using تو with Every Singular You

English you does not reveal number, familiarity, or social distance. Iranian Persian normally addresses one familiar person with تو and second-person singular agreement, but it commonly addresses one unfamiliar, older, professionally senior, or otherwise respected person with شما and second-person plural agreement. Using تو for every singular listener can therefore be grammatically well formed yet socially too intimate.

The choice is relational, not a dictionary equation. تو is natural with close friends, many relatives, children, and people who have established reciprocal familiarity. شما is the safer opening in a service encounter or a new adult relationship. After choosing, keep pronouns, verbs, possessive clitics, and imperatives aligned.

Make the Social Choice before the Verb

The second sentence may address one client. Plural agreement does not imply several people when شما is polite singular.

Agreement, Not the Pronoun Alone, Carries the Choice

Persian often omits subject pronouns. The verb still reveals the address level: بنشین is intimate singular; بنشینید is plural or polite singular. می‌خواهی and می‌خواهید make the same contrast.

Once the pronoun is omitted, English learners sometimes stop monitoring agreement. Treat the entire second-person package as one choice, including possessive ـت versus polite/plural ـتان: اسمت چیست؟ for intimate singular, نامتان چیست؟ for polite singular.

Service Encounters Favor Polite Plural Forms

In shops, clinics, hotels, offices, and first meetings, شما or pronounless plural imperatives are the neutral respectful default. Titles such as آقا and خانم can add courtesy, but they do not replace correct verbal agreement.

An employee may use تو with a small child while addressing the child’s parent as شما. Number alone cannot predict the pronoun; the social relation matters.

Social Distance Can Change

Two adults may explicitly or gradually switch from شما to reciprocal تو. The shift signals closeness, equality, solidarity, or sometimes deliberate informality. It is not simply “incorrect Persian becoming casual.” Conversely, relatives or colleagues may retain شما to express respect or distance.

This explicit negotiation is not mandatory, but it reveals the underlying principle: address forms index a relationship that speakers manage together.

Repair an Overly Familiar Opening

If تو slips out in a context that requires شما, repair both the address and the agreement. A short apology is sufficient; do not continue with a hybrid such as شما می‌خواهی.

For names and titles that support these choices, see Addressing People with آقا، خانم، جان.

Common Mistakes

1. Using تو automatically with an unfamiliar adult

The first sentence is grammatical intimate Persian, but it can sound presumptuous when addressed to an unknown customer.

2. Using singular agreement after polite شما

3. Switching only the pronoun and leaving an intimate imperative

4. Writing the polite present prefix with an ordinary space

5. Assuming plural agreement proves several listeners

شما آماده‌اید؟ is grammatical for one respected listener or several listeners. Context, not the verb ending alone, resolves the number.

6. Treating تو as inherently rude

Politeness depends on relationship. تو is the normal affectionate choice between close friends and many family members.

7. Rejecting colloquial plural agreement with polite شما

Both are coherent register choices. Do not label the colloquial plural ending an error merely because edited prose uses می‌روید.

Key Takeaways

• Use تو with an intimate singular listener and شما with a plural or polite singular listener.
• Polite singular شما takes second-person plural agreement.
• Pronounless verbs, imperatives, and possessive clitics still express the address choice.
• Service encounters normally begin with شما; reciprocal تو can emerge as a relationship becomes familiar.
• Colloquial Tehran شما ... میرین is valid informal politeness; standard writing uses شما ... می‌روید.