Persian Grammar
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The present stem of verbs ending in ستن (-estan) is formed by removing it. There are no exceptions to this rule. The suffix ستن (-estan) is a verb-making suffix.

Infinitive Present Stem
بایستن
bâyestan
بای
bây
دانستن
dânestan
دان
dân
کامستن
kâmestan
کام
kâm
مانستن
mânestan
مان
mân
پایستن
pâyestan
پای
pây
شایستن
shâyestan
شای
shây
توانستن
tavânestan
توان
tavân
یارستن
yârestan
یار
yâr