Learn Italian: Tutte le scimmie saltano nel recinto. - All the monkeys are jumping in the enclosure.

In Italian, when you use a form of tutto (meaning 'all'), you must include the definite article before the noun. You cannot skip it like we sometimes do in English. It has to be tutte le scimmie, which literally translates to 'all the monkeys'.

Why is the word for 'all' written as tutte here instead of tutti?

The word tutto acts like an adjective, meaning its ending has to match the gender and number of the noun it describes. Because scimmie is a feminine plural noun (the plural of scimmia), tutto must change its ending to the feminine plural form, tutte.

Why does the sentence use nel instead of just in?

Nel is a combined word (an articulated preposition). When the preposition in (in) is followed by the definite article il (the) for the masculine singular noun recinto, they merge together to become nel. In Italian, you never write in il as separate words.

Why is saltano translated as 'are jumping' instead of just 'jump'?

The Italian simple present tense, like saltano, translates to both 'jump' and 'are jumping' in English. Italian uses the simple present to describe actions happening right now much more often than English does, so you don't always need a special continuous tense.