
Joseph W. answered 04/19/19
Modern Hebrew for English Speakers
www.pealim.com is a great resource for full conjugations of verbs, if you need to look one up or something. Also some great books for the subject are: Living Hebrew by Yohanan Elihay or Hebrew Verb Tables by Asher Tarmon
The first book separates them out so you can go over all the commonly used verbs and see wich ones are conjugated alike.
Sadly there isn't always a hard fast rule for these verbs, there are common tendencies with each of the root letters though, and with Yohanan Elihay's book you can kind of start to sort them out.