Portal:Esperanto/Grammar of the month/September 2006
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Verbs (action words) are very simple to form in Esperanto: the infinitive (basic verb form) is the root + "-i". For example iri = "to go". To form the present tense, switch the "-i" to "-as": mi iras = "I go" or "I am going" (mi = "I"). The same can be done for past and future tenses: mi iris = "I went" and mi iros = "I will go".