A man shoots a rifle while a dog looks on.
The man has a rifle.
The man shoots the rifle, so it means he has a rifle to shoot.
exists e1 p1 x1 x2.(exists e2 p2 x3.(exists s1.(Theme(s1,x3) & a_on(s1)) & Topic(e2,p2) & Actor(e2,x3) & v_look(e2) & n_dog(x3)) & while(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_shoot(e1) & n_rifle(x2) & n_man(x1))
exists e1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_rifle(x2))