Describing where things are in relation to each other requires a small set of prepositions of place that you'll use constantly once you start talking about rooms, furniture, and objects: sur (on/on top of), sous (under/beneath), dans (in/inside), devant (in front of), derrière (behind), and entre (between). Most of these map fairly directly onto their English equivalents, but a few distinctions are worth being precise about. 'Sur' means resting on a surface (le livre est sur la table — the book is on the table), while 'dans' means contained within something (le livre est dans le sac — the book is in the bag). English speakers sometimes blur 'on' and 'in' more loosely than French allows — French is stricter about surface-contact (sur) versus containment (dans).
Most of these prepositions can combine with 'de' when followed by a definite article, following the normal contraction rules: devant + le becomes 'devant le', but à/de contract with le and les (de + le = du, de + les = des, à + le = au, à + les = aux) — this matters especially for 'à côté de' (next to) and 'près de' (near), which are two-word compound prepositions ending in 'de': à côté de la lampe (next to the lamp) but à côté du canapé (next to the sofa, since 'de le' must contract to 'du').
The construction 'il y a' is one of the most useful and most frequent phrases in French — it means 'there is' or 'there are', and unlike English, it never changes form for singular versus plural: il y a un chat (there is a cat) and il y a trois chats (there are three cats) both use the identical 'il y a'. This is a fixed, invariable expression — literally 'it there has' — and you should not try to conjugate it differently based on number the way English distinguishes 'is' from 'are'. To make it negative, wrap 'ne...pas' around 'y a': il n'y a pas de chat (there isn't a cat / there is no cat) — and notice that after this negation, just like after other negations, the indefinite/partitive article collapses to 'de'.
Exemples
Le chat est sur le canapé.
The cat is on the sofa.
'Sur' = resting on a surface.
Les clés sont sous le tapis.
The keys are under the rug.
Il y a un lit dans la chambre.
There is a bed in the bedroom.
'Il y a' never changes for singular/plural.
La table est devant la fenêtre.
The table is in front of the window.
Le jardin est derrière la maison.
The garden is behind the house.
La cuisine est entre le salon et la salle de bain.
The kitchen is between the living room and the bathroom.
Il y a beaucoup de livres sur l'étagère.
There are a lot of books on the shelf.
Still 'il y a', even though 'livres' is plural.
La lampe est à côté du lit.
The lamp is next to the bed.
'À côté de' + 'le lit' contracts to 'à côté du lit'.
Il n'y a pas de chaise dans cette pièce.
There isn't a chair in this room.
Negation collapses the article to 'de', as with other negated nouns.
Le miroir est près de la porte.
The mirror is near the door.
Erreurs fréquentes
- Conjugating 'il y a' as if it changed for plural, incorrectly saying something like 'ils y ont' for 'there are' instead of keeping the fixed form 'il y a'.
- Confusing 'sur' and 'dans' by treating them as interchangeable the way 'on' and 'in' can feel loosely equivalent in casual English.
- Forgetting to contract 'de' with 'le' or 'les' after compound prepositions like 'à côté de' and 'près de' (saying 'à côté de le lit' instead of 'à côté du lit').
- Leaving the article unchanged after negating 'il y a' (saying 'il n'y a pas un chat' instead of 'il n'y a pas de chat').
- Using 'devant' and 'derrière' in the wrong order relative to the reference object, mirroring English word order instead of French's noun + preposition + reference-noun structure.
Pourquoi ça trompe les anglophones
- English 'there is' / 'there are' changes for number, so learners expect French 'il y a' to do the same and are surprised it's completely invariable.
- English uses 'on' and 'in' somewhat flexibly in casual speech, while French sur/dans track surface-contact versus containment more strictly.
- The contraction of 'de + le' → 'du' and 'de + les' → 'des' inside compound prepositions (à côté du, près des) is an extra transformation step English prepositions never require.