will happen in the future. It is relatively simple to form: Remove the -ti ending from the infinitive form of the verb. Add the -s- suffix which is used to form the Future Tense. Note, that ...š or ...ž + -s- assimilates to š without the final s (the infinitive vežti 'to transport' gives vešiu, veši, veš etc. in the Future Tense). In case the stem itself ends with a final ...s, it is eliminated as well: kąsti (to bite) → kąs. Add the appropriate ending. All the persons in this tense are completely regular (and retain the stress position and intonation of the infinitive), except for the 3rd one. The latter of this tense changes depending on several rules: If the 3rd person's form is stressed in the final or the only syllable with a falling tone (without the inclusion of the reflexive formant -is), it is systematically replaced with a rising tone (kalbė́ti (to speak) → kalbė̃s, pramogáuti (to entertain oneself) → pramogaũs; aukótis (to sacrifice oneself) → aukõsis (the reflexive formant does not count)). This rule does not apply to cases when there the last syllable is not stressed (sáugoti (to protect) → sáugos). Primary verbs acquire a short vowel i or u (instead of long y or ū) when the infinitive and the present tense has a long vowel, but the past tense has a short vowel: (lýti (to rain): lỹja, lìjo → lìs; pū́ti (to rot): pū̃va, pùvo → pùs, most importantly: bū́ti (to be): bū̃na, bùvo → bùs). {| class="wikitable" |- ! ! colspan=1| dìrbti – to work ! colspan=1| norė́ti – to want ! colspan=1| skaitýti – to read ! colspan=1| praũstis – to wash oneself ! colspan=1| bū́ti – to be |- |align="right"|I |dìrbsiu |norė́siu |skaitýsiu |praũsiuosi |bū́siu |- |align="right"|You (singular) |dìrbsi |norė́si |skaitýsi |praũsiesi |bū́si |- |align="right"|He/She/It |dir̃bs |norė̃s |skaitỹs |praũsis |bùs |- |align="right"|We |dìrbsime |norė́sime |skaitýsime |praũsimės |bū́sime |- |align="right"|You (plural) |dìrbsite |norė́site |skaitýsite |praũsitės |bū́site |- |align="right"|They |dir̃bs |norė̃s |skaitỹs |praũsis |bùs |} E.g. dirbsiu = 'I shall work', norėsi = 'You will want', skaitysime = 'We shall read' Compound tenses Compound tenses are periphrastic structures having temporal meanings usually relative to actions indicated by other verbs. Two groups of such tenses exist in modern Lithuanian: Perfect and Inchoative. All of them require an auxiliary verb būti (to be) in its respective form and an active voice participle. Perfect