For the first one, draw a picture of a guy falling or tripping on the stairs. It HAS to be a boy, because his name is Alberto, assuming he's a male.
For the second one, the sentence can be "Juan Carlos se lastimo jugando al básquetbol.", which means that Juan Carlos injured himself playing basketball, which is actually "baloncesto". Draw a picture of a guy with a . bloody knee or somethin', and a basketball in his hand. It has to be a male, his name is Juan Carlos.