IRREGULAR VERBS
Like all languages, Latin has some irregular verbs. The first two to focus on are esse, “to be,” and posse, “to be able.” Look up their forms, and note if it helps you that posse in many of its forms is just a variation of esse. So est is “she is” and potest is “she can.”
There are four other irregular verbs which you should try to get to know. These are ire, go to, ferre, to carry or bear (and also in a metaphorical sense, “I can’t bear it …”), velle, to wish or want, and fieri, to become. The best approach here is to familiarise yourself with these verbs by meeting them in context. There will be some strange-looking forms, such as it for “she goes,” fis for “you become,” and vult for “she wants.” But note also that there are parts of these “irregular” verbs that are perfectly regular (the imperfect of volo, for instance), and that the last four (ire, ferre, velle, fieri) often behave just like third conjugation verbs (the future of fero, for instance, is feram, feres, feret etc.). The verbs may be irregular, but they are not actively evil.