You have encountered a number of irregular verbs. The most common one is sum, esse ("to be"), which is irregular in three tenses (the present, imperfect, and future). Sum and its compounds, like possum, posse ("to be able"), are the only verbs that irregular in three tenses. Most irregular verbs are only irregular in the present. You have already seen volō, velle ("to want") and eō, īre ("to go"). Ferō, ferre is another irregular verbs like these – it is only irregular in the present. This chart summarizes these three verbs:
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Present Tense |
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ferō, ferre |
volō, velle |
eō, īre |
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Singular |
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Persona I |
ferō = I bring |
volō = I want |
eō = I go |
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Persona II |
fers = you bring |
vis = you want |
is = you go |
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Persona III |
fert = he/she/it brings |
vult = he/she/it wants |
it = he/she/it goes |
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Plural |
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Persona I |
ferimus = we bring |
volumus = we want |
imus = we go |
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Persona II |
fertis = y'all bring |
vultis = y'all want |
itis = y'all go |
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Persona III |
ferunt = they bring |
volunt = they want |
eunt = they go |
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Imperfect |
ferēbam, etc. |
volēbam, etc. |
ībam, etc. |
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Future |
feram, etc. (like third conjugation) |
volam, etc. (like third conjugation) |
ībō, etc. (like first conjugation) |