The basic and general use of the Spanish preposition "a" is to express "to/at" in the following contexts:
We use "a" to express "to" + a place. It is generally used with verbs that express movement, e.g. ir or viajar.
Vamos a la biblioteca. Tenemos que estudiar.We are going to the library. We have to study.
Cristina va a la playa todos los días.Cristina goes to the beach every day.
Vamos a viajar de Madrid a Nueva York.We are going to travel from Madrid to New York.
We use "a" to express the time. For example:
Ella se levanta a las siete.She gets up at seven.
or to indicate the end of a period of time. For example:
Trabajo de lunes a viernes. No trabajo los fines de semana.I work from Monday to Friday. I don't work weekends.
See also Using para (not por) for a destination
There are some verbs that use the preposition "a" in certain constructions - see Personal "a" verbs (ver, visitar, buscar, conocer)
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