sentences: an object blocking light causes a shadow & if an object is in the light then that object is blocking the light ->  if an object is in the light then the object will cause a shadow  if an object is in the light then the object will cause a shadow & sunlight is a kind of light ->  if an object is in the sunlight then the object will cause a shadow  if an object is in the sunlight then the object will cause a shadow & a boy is a kind of object ->  if a boy is in the sunlight then the boy will cause a shadow  if a boy is in the sunlight then the boy will cause a shadow & a boy stands in the sunlight ->  the boy in the sunlight will cause a shadow  the boy in the sunlight will cause a shadow & shadow of an object can be seen by eyes -> the boy can see his shadow in the sunlight