It's difficult to find an equivalent for would, it depends on the context, the sentence but I'd say the closest one to would is كان سيكون
Ex: كان سيكون ملكا ان لم يذهب الى فرنسا
= he would've been a king if he didn't go to France
Ex : كنت سأخبرك إن علمت أنه قادم
= I would have told you if I knew he was coming
So it's (verb + كان/ كنت + ســــ)
كان / كنت ... = was. And ســـ means will
Verb ســـ+ فعل = future tense
So it's like a mix between the future and the past (=conditional)
Hope it doesn't make you more confused