<commit_before>---
layout: base
title: 'aux'
shortdef: 'auxiliary'
---

## aux: auxiliary

An auxiliary of a clause is a non-main verb of the clause, e.g., a modal
auxiliary, or a form of "estar", "ser" or "haber" in a periphrastic tense.

Spanish modal auxiliaries include ():

- poder
- saber
- querer
- soler
- deber
- haber (que, de)

<div class="sd-parse">
Ellos han atacado la ciudad
aux(atacado, han)
</div><commit_msg>Add Spanish grammar reference<commit_after>---
layout: base
title: 'aux'
shortdef: 'auxiliary'
---

## aux: auxiliary

An auxiliary of a clause is a non-main verb of the clause, e.g., a modal
auxiliary, or a form of "estar", "ser" or "haber" in a periphrastic tense.

Spanish modal auxiliaries include (Butt and Benjamin, 2013):

- poder
- saber
- querer
- soler
- deber
- haber (que, de)

<div class="sd-parse">
Ellos han atacado la ciudad
aux(atacado, han)
</div>
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