One example of a compound subject and compound predicate is; Mary and Michael collected seashells, and then cleaned them. The subject in this sentence is Mary and Michael, the compound predicate is the collected and cleaning part. This shows that they both did it. The second example is, she was invited by a friend to a tea party, but her parents did not allow her. The third one, I have a lot of work to do, so I will be up all night.