What is 'in' when translated from English to Italian?

Answer 1

In is the same in English and Italian. But it may take the combined form of the preposition with the article -- the singular nella and the plural nelle in the feminine and the singular nel, nello and the plural negli, nei in the masculine as well as the truncated singular/plural nell' before nouns whose spellings begin with vowels -- depending upon context. The pronunciation of the simplest form will be "een" in Italian.