Additional Tehran Reductions: ید to ین

In everyday Tehran Persian, the standard second-person plural ending ـید regularly corresponds to ـین. Standard هستید، دارید، می‌کنید thus have colloquial هستین، دارین، می‌کنین. The change does not create a new person. Both endings address either several people or one person respectfully; what changes is the speaker's register.

The ـین series is (informal, regional: Tehran) and is normal in friendly service encounters, family conversation, messages, and relaxed but polite speech. Standard ـید belongs in edited writing, formal announcements, and careful speech. The mapping is highly regular at the ending, but many common verbs also change their stem or prefix in conversation. Producing a natural form therefore requires more than replacing one final letter.

One Ending, Two Social Functions

English separates plural you from politeness only weakly, and often not at all. Persian شما plus either ending can do both jobs. Situation and addressee determine whether a speaker means “you all” or respectful singular “you.”

The Regular Ending Map

For copular, present, simple-past, past-imperfective, and imperative forms, recognizing the correspondence is usually simple: standard final د is absent and final ن closes the Tehran form. Perfect forms can undergo an additional contraction: standard دیده‌اید may surface as دیدین, the same segmental shape as the colloquial simple past. Context and stress then distinguish the intended reading.

Here تا حالا supplies the experiential time frame, so دیدین is understood as present perfect. Without such context, the same written colloquial form can also represent simple past “you saw.”

The standard imperative system is presented on Polite and Plural Imperatives. This page changes the social realization of the ending, not the command's syntax.

When the Rest of the Verb Also Changes

The ending is regular, but conversational stems are not all obtained by a single deletion. Standard می‌خواهید، می‌آیید، می‌روید correspond to colloquial می‌خواین، میاین، میرین; each includes the ending change plus a familiar Tehran stem or stem-plus-prefix shape. Standard بنشینید likewise has colloquial بشینین, which uses the ordinary conversational imperative stem.

Notice that می‌کنین keeps می‌ with its standard ZWNJ, whereas conventional colloquial spelling often writes میرین and میاین without one in this corpus. These are lexicalized house spellings, not evidence that every می‌ loses its boundary.

Polite Does Not Mean Formal

Formality describes the setting and textual style; politeness describes the social relation. A shopkeeper may address one customer politely with شما and ـین, while a government form uses impersonal or standard ـید language. Conversely, close friends can use ـین simply because there are several addressees, with no special deference.

The pronoun شما itself does not force formal morphology. For its singular-respectful and plural readings, see Plural and Colloquial Pronoun Forms.

A Connected Exchange

Every strong cue supports the same register: ـین، آره، واسه، تو، ـتون، می‌کنه. A speaker could reduce less, but this complete system is a safer production model than scattering one colloquial ending through official prose.

Common Mistakes

1. Adding ـین after the full standard ending

2. Changing the ending but keeping an unnatural hybrid stem

3. Assuming ـین is disrespectful

4. Using colloquial spelling in formal instructions

Key Takeaways

• Standard ـید maps to Tehran ـین in second-plural and polite-singular forms.
• The social functions stay constant: هستین can address a group or one respected person.
• Check the whole verb, because می‌خواین، میاین، میرین، بشینین include additional colloquial stem patterns.
• ـین is conversational, not inherently rude; ـید remains the edited and formal choice.
• Build a coherent clause around the ending instead of mixing one spoken suffix with strongly bookish morphology.