Esperanto has three tenses and three moods, which can be easily determined by looking at the ending of a verb. Verbs are not conjugated for person or number, only tense and mood.
- Present tense, with the ending -as. Mi kantas = I sing. Ili parolas = they speak.
- Future tense ends in -os. Mi kantos = I will sing. Ŝi kuiros = she will cook.
- Past tense -is. Mi kantis = I sang.
- Infinitive mood -i. Kanti = To sing.
- Conditional mood -us. Se mi kantus = If I would sing.
- Jussive mood -u. = Kantu! = Sing! Enlitiĝu! = Go to bed!
The jussive mood, although primarily used to give commands, is also used to indicate that the subject of the sentence has an obligation or should do something. For instance: Mi tajpu la leteron means "I should type the letter". Compare this to Mi devas tajpi la leteron, which suggests more urgency ("I must type the letter").