Verbs
| Main verb forms | |||||
| Tense | Ending | -ar verbs | -er verbs | -ir verbs | |
| Infinitive | -r | parlar | vider | audir | |
| Present | – | parla | vide | audi | |
| Past* | -va | parlava | videva | audiva | |
| Future* | -ra | parlara | videra | audira | |
| Conditional* | -rea | parlarea | viderea | audirea | |
| Present participle | -(e)nte | parlante | vidente | audiente | |
| Past participle | -te | parlate | vidite | audite | |
The verb system is a simplified version of the systems found in English and the Romance languages. There is no imperfective aspect, as in Romance, no perfect as in English, and no continuous aspect, as in English and some Romance languages. Except (optionally) for esser 'to be', there are no personal inflections, and the indicative also covers the subjunctive and imperative moods. Three common verbs (esse, habe and vade) usually take short forms in the present tense (es, ha and va respectively), and a few optional irregular verbs are available.
For convenience' sake, this section often uses the term tense to also cover mood and aspect, though this is not strict grammatical terminology.
The table at the right shows the main verb forms, with examples for -ar, -er and -ir verbs (based on parlar 'to speak', vider 'to see', and audir 'to hear').
The simple past, future, and conditional tenses correspond to semantically identical compound tenses (composed of auxiliary verbs plus infinitives or past participles). These in turn furnish patterns for building more-complex tenses such as the future perfect.
Read more about this topic: Interlingua Grammar
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