andarsene

1. Structure and Conjugation
The verb consists of three parts: andare + pronominal particle + ne. When followed by ne, the final -i of the reflexive-style pronouns (mi, ti, si, ci, vi) changes to -e. This follows the logic of combined pronouns. Remember that the root verb andare is highly irregular in the present tense:

• Me ne vado (I'm leaving)
• Te ne vai (You're leaving)
• Se ne va (He/She is leaving)
• Ce ne andiamo (We're leaving)
• Ve ne andate (You all are leaving)
• Se ne vanno (They're leaving)

2. The Role of 'Ne' and Nuance
In this context, the particle ne acts as a locative particle (specifically moto da luogo), meaning "from here" or "away from this place." This distinguishes andarsene (to leave/go away) from the simple andare (to go). Furthermore, unlike partire (to depart/leave for a destination), andarsene focuses on the act of moving away from a specific spot or situation, often carrying a nuance of finality or annoyance.

3. Compound Tenses
In tenses like the passato prossimo, andarsene always uses essere as the auxiliary. The past participle must agree with the subject in gender and number. Note that ne drops its vowel and becomes n' almost always before è, but this elision is optional (though common) before imperfect forms like era or ero (e.g., se ne era or se n'era):

• Lei se n'è andata (She left)
• Loro se ne sono andati (They left)

4. Placement and Modal Verbs
Pronouns usually precede the verb, but they attach to the end of the infinitive or gerund (e.g., andarsene, andandosene). When using modal verbs, you have two choices: Me ne voglio andare or Voglio andarmene. In the passato prossimo, if the pronouns precede the modal verb, you must use essere (Me ne sono voluto andare). If they attach to the infinitive, you can traditionally use avere (Ho voluto andarmene), but essere is also perfectly acceptable and common because andare takes essere (Sono voluto andarmene).

5. Imperative Forms
For the informal imperative and the imperative with noi and voi, the pronouns attach to the end of the verb: Vattene! (Leave!), Andiamocene! (Let's leave!), Andatevene! (Leave!). Notice that for Vattene!, attaching the pronouns to the truncated informal imperative va' triggers a spelling change where the 't' is doubled (va' + te + ne = vattene). However, for the formal imperative, the pronouns precede the verb: Se ne vada! (Please leave!). For the informal negative command, you can use two placements: Non te ne andare! or Non andartene!