I also added in my notes the third and fourth conjugations, although Wheelock didn't take them up. You'll see in the chapter that the third and forth conjugation verbs follow the same rules for forming the passive voice in the present system as those governing first and second conjugation verbs. Let's do a little review for a moment.
Latin verbs have four principal parts.
Let's look at them in reverse order. Once you get to the fourth principal part of a verb, there is only one set of formulae for forming the different perfect tenses passive. The perfect system active, similarly, follows the same rules for all four conjugations. The purpose of this review is to remind you that verbs of different conjugations differ from one another only in the present system. Strictly speaking, therefore, it is meaningless to talk about forming the perfect system of a first, second, third or fourth conjugation verb.