Definition
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ayer
Ayer es el día que precede al día de hoy.
Yesterday is the day that comes before today.
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Ayer fui al cine con mis amigos.
Yesterday I went to the cinema with my friends.
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Estudie mucho para el examen que tuve ayer.
I studied a lot for the exam I had yesterday.
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Ayer llovió todo el día.
It rained all day yesterday.