Grammar: Shut

Lambert leaves work at 7 pm every Friday night. He is always the last to leave. He walks out the building and turns around and shuts the door. He locks it right away and then pulls out his ticket for the train and walks to the station. Sometimes he forgets to turn off one of the lights at the back of the office, but his boss turns a blind eye towards that since Lambert is otherwise very reliable. His boss can also shut the light off on Saturday, since he almost always comes in to work on Saturday. He can always count on Lambert to shut down the factory on Friday night perfectly.