who to write this in French how many people (personnes) there are

To write "how many people (personnes) there are" in French, you would say "combien de personnes il y a." Here's an explanation on how to arrive at this translation:

1. Start with the phrase "how many people." The translation of "how many" is "combien" in French.
2. The word for "people" in French is "personnes."
3. In French, the verb "to be" is "ĂȘtre." To say "there are," we use the phrase "il y a," which directly translates to "there is/there are."
4. Finally, combine all the elements to form the sentence: "combien de personnes il y a."

Remember that translation sometimes depends on the context, so the provided translation may vary slightly based on the specific sentence or situation.