Impersonal & Passive si

📌 Nota grammaticale

When using the impersonal 'si' with intransitive verbs, verbs without objects, or reflexive verbs, the verb is always conjugated in the third-person singular (lui/lei). If a reflexive verb is used, the 'si' changes to 'ci' to avoid saying 'si si'.

📌 Nota grammaticale

The passive 'si' is used with transitive verbs when there is a direct object. When the noun following 'si' is singular, the verb must be in the third-person singular (e.g., si vende, si mangia).

📌 Nota grammaticale

When the noun receiving the action is plural, the verb must also be plural (third-person plural: loro) to agree with the subject. For example: si vendono, si parlano.

📌 Nota grammaticale

The passive 'si' is much more common in everyday spoken Italian than the traditional passive formed with 'essere + past participle'. It makes sentences flow naturally without specifying an agent.

📌 Nota grammaticale

When forming compound tenses (like the passato prossimo) with the impersonal 'si', the auxiliary verb is ALWAYS 'essere'. Additionally, the past participle ends in '-i' if the underlying sense is plural, or '-o' if singular/intransitive.

📌 Nota grammaticale

In compound tenses with the passive 'si', the past participle agrees in gender and number with the grammatical subject (the noun following the verb). Example: si è rotto (sing. masc.), si sono vendute (plur. fem.).

📌 Nota grammaticale

You can transform a sentence with 'noi' (we) into an impersonal statement by changing the verb to the third-person singular and adding 'si'. This is extremely common when giving general advice or making observations.

📌 Nota grammaticale

When modal verbs (dovere, potere, volere) precede an infinitive in an impersonal structure, 'si' attaches to the modal verb (or precedes it), and the main verb stays in the infinitive. The modal matches the singularity/plurality of the following noun if passive.

📌 Nota grammaticale

When an impersonal or passive structure involves a reflexive verb (which uses 'si'), the particle 'si' changes to 'ci' to avoid the awkward double 'si si'. Therefore, 'si + si' becomes 'ci si'.

📌 Nota grammaticale

In compound tenses, sentences using 'ci si' with reflexive verbs take the auxiliary 'essere', and the past participle agrees with the plural/singular subject implied by the group, often defaulting to masculine plural if generic.

📌 Nota grammaticale

The impersonal 'si' has no direct object and uses a singular verb (e.g., si vive bene). The passive 'si' has a direct object which dictates whether the verb is singular or plural (e.g., si mangia la mela vs. si mangiano le mele).

📌 Nota grammaticale

When using direct/indirect object pronouns (mi, ti, lo, la, ci, vi, li, le) with an impersonal or passive structure, the particle 'si' changes to 'se' to avoid consecutive 'si' sounds (e.g., se lo fa, se ne parla).