The Future active participle, or simply “future participle”, is formed from the infinitive of a verb and the suffix ی (i). It literally means “going to, about to” but depending on the context, it can create words that convey “due to”, “necessary to”, “suitable to”, “worthy of”, “able to”, etc.

Infinitive Future active participle
شستن
šostan
to wash
شستنی
šostani
washable; due to wash (e.g. laundry)
دیدن
didan
to see
دیدنی
didani
worth seeing
حفظ‌ کردن
hefz kardan
to memorize
حفظ‌کردنی
hefzkardani
necessary to memorize
شکستن
šekastan
to break
شکستنی
šekastani
liable to break, breakable
خواندن
xwândan
to read
خواندنی
xwândani
worth reading
شنیدن
šenidan
to hear
شنیدنی
šenidani
worth hearing
دوست داشتن
dust dâštan
to love
دوست‌داشتنی
dustdâštani
deserving to be loved, lovable
به یاد ماندن
be yâd mândan
to remember
به‌یادماندنی
beyâdmândani
worth remembering, memorable
باور کردن
bâvar kardan
to believe
باورکردنی
bâvarkardani
able to be believed, believable

Examples

اگر آمدنی شدم زنگ می‌زنم
Agar âmadani šodam, zang mizanam
I’ll call you if I’m going to come
برگشتنی نیست
Bargaštani nist
He/She/It isn’t going to return
دیدنیها
didanihâ
that are worth seeing, attractions
دیدنی‌ترین جاهای یزد کجاست؟
Didanitarin jâhâ-ye Yazd kojâ’st?
Where are the best attractions/sights of Yazd?
اصفهان دیدنیهای بسیاری دارد
Esfahân didanihâ-ye besyâr-i dârad
Esfahan has many attractions

Participles can function as an adjective, adverb or noun. In دیدنیها (“didanihâ”), the future active participle دیدنی (“didani”) is functioning as a noun and has taken the plural suffix. In دیدنی‌ترین (“didanitarin”), the future active participle دیدنی (“didani”) is functioning as an adjective and has taken the superlative suffix.

Negative form

The negative form of future participle is formed by prefixing ن (na-) to the infinitive.

Negative Infinitive Future Active Participle
باور نکردن
bâvar nakardan
not to believe
باورنکردنی
bâvarnakardani
impossible to believe, incredible
نشکستن
našekastan
not to break
نشکستنی
našekastani
not liable to break, unbreakable