<Li> Voice: active or passive </Li> <P> The modern Spanish verb system has sixteen distinct complete paradigms (i.e. sets of forms for each combination of tense and mood (tense refers to when the action takes place, and mood or mode refers to the mood of the subject--e.g., certainty vs. doubt), plus one incomplete paradigm (the imperative), as well as three non-temporal forms (the infinitive, gerund, and past participle). </P> <P> The fourteen regular tenses are also subdivided into seven simple tenses and seven compound tenses (also known as the perfect). The seven compound tenses are formed with the auxiliary verb haber followed by the past participle . Verbs can be used in other forms, such as the present progressive, but in grammar treatises they are not usually considered a special tense but rather periphrastic verbal constructions . </P> <P> A verbal accident is defined as one of the changes of form that a verb can undergo . Spanish verbs have five accidents . Every verb changes according to the following: </P>

When is a verb considered a regular verb in spanish
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