The passive is more limited then the active voice in that only transitive verbs may be in the passive. In fact, some passive sentences in English have no active voice counterpart, such as
Mehdi was born in Tehran.
?His mother bore Medhi in Tehran.
There is of course the active verb “to bear”, as in “The lioness bore three cubs.” However, for all intents and purposes, there is no active voice counterpart to to be born to talk about facts concerning human birth. Other verbs that occur commonly in the passive are be deemed, be fined, be hospitalize, be jaild, be scheduled, be shipped, be staffed, be suspended.