A boy blowing bubbles into the camera.
The old man is riding his bike.
Boy is usual used for child where in old man is probably not a child. It would be difficult to ride a bike and blow bubbles.
exists e1 x1 x2 x3 x4.(n_camera(x4) & a_topic(x1) & into(e1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_blow(e1) & n_bubble(x3) & (x1 = x2) & n_boy(x1))
exists e1 s1 x1 x2.(n_bike(x2) & of(x2,x1) & n_male(x1) & n_man(x1) & a_old(s1) & Theme(s1,x1) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1))