Esperanto Grammar - Verbs

Verbs

All verbal inflection is regular. Three tenses together form what is called the indicative mood. The other moods are the infinitive, conditional, and jussive. No aspectual distinctions are required by the grammar, but derivational expressions of Aktionsart are common.

Verbs do not change form according to their subject. I am, we are, and he is are simply mi estas, ni estas, and li estas, respectively. Impersonal subjects are not used: pluvas (it is raining); estas muso en la domo (there's a mouse in the house).

Most verbs are inherently transitive or intransitive. As with the inherent part of speech of a root, this is not apparent from the shape of the verb and must simply be memorized. Transitivity is changed with the suffixes -igi (the transitivizer/causative) and -iĝi (the intransitivizer/middle voice):

akvo bolas je cent gradoj (water boils at 100 degrees)
ni boligas la akvon (we boil the water).

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