A single subject performs more than one action or exists in more than one state of being. These are simple sentences with compound predicates . Notice that number nine has two action verbs and two objects. Number 12 has one linking verb and one action verb. 9 Winds uproot trees and blow down power lines.
School board dallies and loses state grant.
Team wins game but loses Johnson for season. Coach is irate about officials and files complaint. Jim ate a hamburger, slept an hour, swam across the lake, saw his girl friend , and was happy for the rest of the day. More than one subject with two or more predicates. Numbers 17 and 18 are simple sentences which contain both compound subjects and compound predicates.