Jesse is entering in a marathon.
Lola mailed the letter.
The letter was mailed by Claire.
The pictures were organized by Ethan.
Mary is singing in the chorus.
The reports were finished last week.
When the subject is doing the verb.
When the verb is being acted upon.
When the subject is being acted upon.
When the verb is doing the subject.
The students were having trouble with the homework.
Many cookies must have been eaten by the children.
Joann said the homework was hard.