Combined pronouns unite an indirect pronoun and a direct pronoun in the same block in front of the verb. In modern Italian the most used forms are mi, ti,ci, vi plus lo, la, li, le, and they are often combined as a single word. In simple tenses the combined block goes before the verb; in compound tenses it goes before the auxiliary. With the infinitive, the gerund, and the positive imperative the block can attach to the verb as a suffix.

In combined pronouns the indirect pronoun comes before the direct pronoun. The most frequent base forms are mi, ti, ci, vi as indirects and lo, la, li, le as directs. The combinations are written as a single block without spaces and without commas. In a sentence, the block behaves as a single pronominal unit.

The main forms of the combined pronouns are mi + lo, mi + la, mi + li, mi + le, and similarly with ti, ci, vi. These forms become melo, mela, meli, mele; telo, tela, teli, tele; celo, cela, celi, cele; velo, vela, veli, vele. With lo and la the consonant l remains stable in the combination. With li and le the sequence is preserved without doubling.

In the simple indicative and subjunctive tenses the block goes before the conjugated verb. In compound tenses it goes before the auxiliary have or be. With the infinitive the block can attach to the infinitive as a suffix, forming a single word. With the gerund and the present participle the block can attach similarly.

When the block is clitic, it appears before the verb and remains separated from the verb in writing. When the block is attached, it joins the verb forming a single word, typically with the infinitive and with the positive imperative. In the positive imperative the block attaches to the verb without spaces. In the negative imperative di + infinitive is used and the block behaves as with the infinitive.

In the forms melo, telo, celo, velo the final o is the same as lo and no extra vowels are added. In the forms mela, tela, cela, vela the final a is the same as la. The pronunciation tends to keep a single central l without doubling it. In rapid speech the sequence can be pronounced fluently as a single sound unit.

The direct pronoun in the block determines the past participle agreement when the rules require it. With lo and la the past participle tends to agree in gender and number when the direct precedes the verb. With li and le the past participle tends to agree in number and with le also in gender. In compound tenses this agreement applies when the block precedes the auxiliary.

With the polite form you use le as indirect and form combinations such as le + lo and le + la. These combinations yield lelo and lela, which are rare in contemporary spoken Italian and more common in formal written Italian. With si as a reflexive pronoun you avoid combinations such as si + lo and si + la, preferring periphrasis or other constructions. In practical communication one tends to simplify, avoiding sequences that sound unnatural.

Combined pronouns unite an indirect and a direct pronoun in a stable block like melo, telo, cela, vele. The block is placed before the verb or attaches to the infinitive depending on the structure of the sentence. The agreement of the participle depends on the direct when the block precedes the auxiliary. Writing and pronunciation keep the single l without adding sounds or letters.