Someone other than his brother could have showed the trick to the skateboarder. The skateboarder could just be having fun with no intention of trying to perfect this trick.


Consider the statement "a boy in a purple shirt is doing a skateboard stunt on a wooden ramp beside a white building.". Based on this "A boy is trying to perfect a skateboard trick his brother showed him." a true statement? Yes, no, or I don't know?