ariadnaavalosagurto

[hazy epoch]

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[fiery moss]

"au" is the mandatory contraction of à + le
"aux" is the mandatory contraction of à + les
à + la doesn't have a contraction

so
les enfants vont à + le lit => les enfants vont au lit
ils vont à + la boulangerie => ils vont à la boulangerie

___
similarly,
de + le => du
de + les => des
ex:
j'ai besoin du camion (camion is masculine)
j'ai besoin de la voiture (voiture is feminine)

-# note: this only applies when le/les is an article (introducing a noun). You might see stuff like "tu n'as qu'à le dire" where "le" has a different function