In Italian, when certain simple prepositions are followed by a definite article (the), they must fuse together to form a single word. These are called articulated prepositions. This fusion is mandatory for the prepositions di, a, da, in, and su.
The form of the articulated preposition depends on the gender (masculine/feminine) and number (singular/plural) of the noun, as well as the first letter of the following word. You essentially take the preposition and add the ending of the definite article.
Basic Patterns:
The rules for which article to use (e.g., il vs lo) are the same as for standard definite articles.
The preposition con (with) behaves slightly differently. While it can fuse with il to become col and with i to become coi, it is also perfectly correct (and very common in formal writing) to keep them separate: con il or con i. For all other articles (la, lo, le, gli), they always remain separate.
Mastering these forms is essential for Italian syntax as they ensure the natural flow of the language.
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