No. 85 in French

au

"Au" is the contraction of "à" (to, at) and "le" (the) in French, meaning "to the" or "at the."

In a sentence

Je vais au parc.
I am going to the park.
In this sentence, 'au' is a contraction of 'à le', which means 'to the'. It is used because 'parc' is a masculine singular noun and requires the preposition 'à' to indicate movement towards it.
Il travaille au bureau.
He works at the office.
Here, 'au' is used as a contraction of 'à le', indicating location. The noun 'bureau' is masculine singular, which determines the use of 'au'.
Au printemps, les fleurs fleurissent.
In spring, the flowers bloom.
In this context, 'au' is a contraction of 'à le' and is used to express 'in the' with a masculine singular noun representing a season.

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