Learn French: Nous regardons les étoiles sur le toit chez elle. - We are looking at the stars on the roof at her place.

The word chez is a very common preposition in French that means "at the home of" or "at the place of". Instead of saying "at the house of her" using the word for house (maison), you simply combine chez with the pronoun elle (her) to mean "at her place".

Why is it chez elle and not chez sa or chez la?

After prepositions like chez, avec (with), or pour (for), you must use a specific set of pronouns called "stress pronouns" (such as moi, toi, lui, elle). Elle is the stress pronoun for "her". You can't use sa, because that is a possessive word meant to go directly in front of a noun (like sa maison for "her house").

The English translation says "looking at", but there is no word for "at" in the French sentence. Why is that?

The French verb regarder translates directly to "to look at" or "to watch". The "at" is already built into the meaning of the verb, so you never add an extra preposition like à after it. You just put the object right after the verb: Nous regardons les étoiles.

Do I pronounce the 's' in les before étoiles?