Active vs. passive verbs

I will write some examples about Active vs. passive verbs and I will explain that.


First example:

Lessons are often taught by experience.
This sentence is passive because the subject, Lessons.

Experience teaches many lessons.
This sentence is Active because the subject, Experience, names the actor.


Let us go to another example:

The board of directors acknowledged Martha’s participation in the literacy program.
This sentence is Active because the subject, board, names the actor.

Martha’s participation in the literacy program was acknowledged by the board of directors.
This sentence is passive because the subject is participation.