Simple Harmonic Motion

One example of simple harmonic motion is a swing , why?? Because I think the move kinda in the same motion but a pendulum swings right and left but a swing the ones in the park swings back and front. A other example of simple harmonic motion is a church bell the real big ones they swing right and left like the pendulum but at a different speed because the have different mass. Lastly an example of simple harmonic motion is when a bouie is floating on top of the water in the ocean. The swinging is what makes it a simple harmonic motion, it swing back and forth , sometimes front and back.