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The way the future tense forms are built depends on the aspect (perfectiveness vs. imperfectiveness) of a given verb.
Perfective verbs have simple future forms (made of the main verb only) and the imperfective verbs have compound future forms (made of the main verb and an auxiliary verb).
The verbs być to be and měć to have, although both imperfective, have simple future forms that are created in an irregular way.
Perfective verbs make their future tense forms using the present stem and the exact same endings that are used with imperfective verbs to form the present tense:
| number | person | -e- stems | -i- / -y- stems | -a- stems |
| sing. | 1. | -u | -”u | -a-m |
| 2. | -’e-š | -i-š (-y-š) | -a-š | |
| 3. | -’e | -i (-y) | -a | |
| du. | 1. | -’e-moj | -i-moj (-y-moj) | -a-moj |
| 2. | -’e-tej | -i-tej (-y-tej) | -a-tej | |
| 3. | -’e-tej | -i-tej (-y-tej) | -a-tej | |
| pl. | 1. | -’e-my | -i-my (-y-my) | -a-my |
| 2. | -’e-će | -i-će (-y-će) | -a-će | |
| 3. | -’e-ja | -”a | -a-ja |
Before the -’e-, -”u- and -”a- endings the same consonant changes apply as in the present tense.
Although these endings are the very same as in the present tense, there is no ambiguity in terms of tense when a particular verb form is considered. A perfective verb used with the above endings is always in future, since these verbs are not used for present at all. On the other hand, an imperfective verb with these endings attached is always in present as imperfective verbs make their future tense in a fully different way.
Consider the impf.-perf. verb pair pisać
An
přinjesć přinjese
| pers. | singular | dual | plural |
| 1 | přinjesu | přinjesemoj | přinjesemy |
| 2 | přinjeseš | přinjesetej | přinjeseće |
| 3 | přinjese | přinjesetej | přinjeseja |
An
skónčić skónči
| pers. | singular | dual | plural |
| 1 | skónču | skónčimoj | skónčimy |
| 2 | skónčiš | skónčitej | skónčiće |
| 3 | skónči | skónčitej | skónča |
An -i-/-y- stem verb
přeprosyć přeprosy
| pers. | singular | dual | plural |
| 1 | přeprošu | přeprosymoj | přeprosymy |
| 2 | přeprosyš | přeprosytej | přeprosyće |
| 3 | přeprosy | přeprosytej | přeproša |
An -a- stem verb
napisać napisa
| pers. | singular | dual | plural |
| 1 | napisam | napisamoj | napisamy |
| 2 | napisaš | napisatej | napisaće |
| 3 | napisa | napisatej | napisaja |
być je
| pers. | singular | dual | plural |
| 1 | budu | budźemoj | budźemy |
| 2 | budźeš | budźetej | budźeće |
| 3 | budźe | budźetej | budu |
měć ma
| pers. | singular | dual | plural |
| 1 | změju | změjemoj | změjemy |
| 2 | změješ | změjetej | změjeće |
| 3 | změje | změjetej | změja |
The future tense of imperfective verbs is fairy simple as all we need to do is to take the basic infinitive form of a werb and put the according future form of the być to bee auxiliary verb in front of it.
An
njesć njese
| pers. | singular | dual | plural |
| 1 | budu njesć | budźemoj njesć | budźemy njesć |
| 2 | budźeš njesć | budźetej njesć | budźeće njesć |
| 3 | budźe njesć | budźetej njesć | budu njesć |
An
kónčić kónči
| pers. | singular | dual | plural |
| 1 | budu kónčić | budźemoj kónčić | budźemy kónčić |
| 2 | budźeš kónčić | budźetej kónčić | budźeće kónčić |
| 3 | budźe kónčić | budźetej kónčić | budu kónčić |
An -i-/-y- stem verb
prosyć prosy
| pers. | singular | dual | plural |
| 1 | budu prosyć | budźemoj prosyć | budźemy prosyć |
| 2 | budźeš prosyć | budźetej prosyć | budźeće prosyć |
| 3 | budźe prosyć | budźetej prosyć | budu prosyć |
An -a- stem verb
pisać pisa
| pers. | singular | dual | plural |
| 1 | budu pisać | budźemoj pisać | budźemy pisać |
| 2 | budźeš pisać | budźetej pisać | budźeće pisać |
| 3 | budźe pisać | budźetej pisać | budu pisać |
In a sentence, the two parts of a compound future form may be separated by other words, ex. budu tam čakać I will wait there. The order of the two parts may also be reversed, ex. spěwać budu přeco I will always sing.