Adverbs antes and después are used to make temporal references. They can be translated into English as before and after, respectively.
Using Después and Antes
Rule 1. Antes is used to indicate that one action was performed prior to another.
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Rule 2. Después is then used to indicate that an action was performed when another action had already taken place.
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The Adverbs Después and Antes Form
Rule 1. These prepositions are almost always accompanied by the preposition de. Remember that the preposition de + el contracts to del.
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Rule 2. These adverbs can be preceded by a noun.
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Rule 3. They can be preceded by a verb in the infinitive form.
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Rule 4. When used with a verb in the subjunctive, the combination después/antes de is accompanied by que.
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Quiz
1/3____________ (after) de clases vamos a tomar un café.