Question 1

Why is the verb plural (validan) instead of singular (valida)?

Accepted Answer

This sentence uses the reflexive passive (pasiva refleja). In this structure, the thing receiving the action (los pases) is actually the grammatical subject of the sentence. Because los pases is plural, the verb must match it and be plural (validan). Literally, the structure functions as if saying 'the passes validate themselves.'

Question 2

Could I use the regular passive voice and say Los pases son validados al entrar?

Accepted Answer

You could, but it would sound formal or bureaucratic. The regular passive voice (using ser + past participle) is less common in spoken Spanish. For general statements where the person doing the action isn't specified, native speakers overwhelmingly prefer the reflexive passive (se validan).

Question 3

Is it okay to change the word order and say Se validan los pases al entrar?

Accepted Answer

Yes, absolutely. In fact, putting the se + verb combination before the subject is extremely common in Spanish, especially when the subject isn't a specific person. Both word orders are completely natural, and putting the verb first simply places a slight emphasis on the action itself rather than on the passes.

Question 4

Why do we use the infinitive entrar after al instead of conjugating it?

Accepted Answer

The combination of al (the contraction of a + el) followed by an infinitive is a specific structure in Spanish that translates to 'upon doing something' or 'when doing something.' Because al acts like a preposition here, it must be followed directly by the infinitive form (entrar) rather than a conjugated verb.

Los pases se validan al entrar.

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