For diagramming practice, here are some sentences that may use subjects, verbs, objects, modifiers, appositives, objective complements, verbal and prepositional phrases., or clauses. (P.S. These are difficult; work slowly.)

1. Teaching school is what I do. [solution]
2. Rising early, I drive to school while traffic is light. [solution]
3. The boy who is covered with suds helped me to wash my car. [solution]
4. He and I made the car a bright clean red. [solution]
5. That was too bad, since the car had been white. [solution]
6. It was clear that something had gone wrong. [solution]
7. I gave replacing the car (or the boy) serious consideration. [solution]
8. When I rethought the situation, I changed my mind. [solution]
9. The boy was my student, and he had therefore suffered enough. [solution]
10. I knew he would succeed at whatever he tried.. [solution]