A working thesis statement is similar to a regular thesis statement. The only difference is that you can change this one as much as you want before you decide on your last thesis statement. A working statement is not your final version of the thesis statement.
1. The boys are full of mischief and always looking for trouble.
2. I waited at the starting line to begin the race.
3. He arrived late because he had an appointment elsewhere.
4. After much discussion, he approved the project.
Hope that helps!