Persian Grammar
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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
shostan
to wash
شستنی
shostani
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
shekastan
to break
شکستنی
shekastani
liable to break, breakable
خواندن
khwândan
to read
خواندنی
khwândani
worth reading
شنیدن
shenidan
to hear
شنیدنی
shenidani
worth hearing
دوست داشتن
dust dâshtan
to love
دوست‌داشتنی
dustdâshtani
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
capable of being believed, believable

More examples:

اگر آمدنی شدم زنگ می‌زنم
Agar âmadani shodam, zang mizanam
I'll call you if I'm going to come
برگشتنی نیست
Bargashtani nist
He/She/It isn't going to return
دیدنیها
didanihâ
that are worth seeing, attractions
بهترین جاهای دیدنی یزد کجاست؟
behtarin jâhâ-ye didani-ye Yazd koj1'st?
Where are the best attractions/sights in Yazd?
اصفهان دیدنیهای بسیاری دارد
Esfahân didanihâ-ye besyâr-i dârad
Esfahan has many attractions

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
nashekastan
not to break
نشکستنی
nashekastani
not liable to break, unbreakable