Past and present stems of Persian verbs are different. Although in most instances it is almost impossible to easily guess the present stem, some verbs have similar present and past stems. The following can help in guessing and remembering some of the regularly predictable present stems.

For most verbs ending in idan, remove the idan from the past stem, and then add می mito the beginning. For example, for the verb “to laugh,” change the infinitive خندیدن xandidan to خند xand and then add می mi to make میخند mixand. To these, add present tense personal endings as follows:

Other verbs in this category include خریدن and رسیدن.

For most verbs ending in andan, remove an from the infinitive and then add می to the beginning. For example, for the verb ‘to dig’, change the infinitive کندن kandan to کند kand and then add می to make میکن mikan. To this, add present tense personal endings. Other verbs in this category include راندن, خواندن, and ماندن.

For verbs, the final vowel of which before the infinitival ending is u, remove udan at the end of the infinitive and add ‘a’. Then add می to the beginning. For example, for the verb ‘to rob’, change the infinitive ربودن robodan to میربا, then add the personal endings. Other verbs in this category include ستودن sotodan ‘to admire’ and گشودن
gošudan ‘to open’.

For many verbs with the infinitival ending shidan, remove shidan and then add می to the beginning. For example, for the verb ‘to boil’, change the infinitive جوشیدن jušidan to جوش juš and then add می to make میجوش mijuš. To this add present tense personal endings. Other verbs in this category include پاشیدن, پوشیدن, تراشیدن, and کوشیدن.