On a dit la verité

Question

Even when on means we, it is still conjugated as a singular person.  I seem to think that sometimes it changes to a plural conjugation, is that when the verb is conjugated with être?

Answer

Bonjour Jennifer,
I believe that you are mixing two different lessons in this question.  The word «on» has several meanings, one of which is «we», This use of "on" is for a specific group of people of which you're part: e.g. 'My friends and I'.
Here "on" is equivalent in meaning to "nous" (we).
Other meanings are:  On : one/you/people
With these different usages, the conjugation following «on» is third person singular.
The only occasion where «être» is used is with a verb where the auxiliary is être which has nothing to do with «on».
As for the other part of your question, there is an instance where the verb following «on» changes from the third persona singular to, usually, a plural tense and agrees correspondingly.  That however is independent of être unless the verb requires être as the auxiliary in the conjugation.
I hope you find this helpful.
Bonne chance.

Answer

Please give an example when a plural verb would follow on.