The si passivante is similar to the si impersonale in that it is used to describe what people (in general) do but it has one major difference: the si passivante requires a subject (singular or plural), and the form of the verb (third person singular or plural) agrees with that subject:
Non si beve il vino rosso freddo.
You don’t drink cold red wine.
Si effettuano traduzioni dal tedesco e dal francese.
They do translations in German and French.
Si mangiano i tortellini in brodo o al sugo.
You eat tortellini in broth or with (red) sauce.
The si passivante is formed with transitive verbs.