A man and a smiling young boy in a float vest are swimming together.
A father teaches his son to swim.
The man and the boy are not necessarily father and son. The man is not necessarily teaching the boy to swim.
exists e1 e2 p1 s1 x1 x2 x3 x4 x5.(exists s2.(Theme(s2,x1) & a_together(s2)) & Topic(e2,p1) & Actor(e2,x1) & v_swim(e2) & subset_of(x3,x1) & in(x3,x4) & n_vest(x4) & of(x4,x5) & n_float(x5) & n_boy(x3) & a_young(s1) & Theme(s1,x3) & Actor(e1,x3) & v_smile(e1) & subset_of(x2,x1) & n_man(x2))
exists e1 p1 x1 x2 x3.(Topic(e1,p1) & exists e2.(Actor(e2,x1) & v_swim(e2)) & Theme(e1,x3) & Actor(e1,x2) & v_teach(e1) & n_son(x3) & of(x3,x1) & n_male(x1) & n_father(x2) & n_father(x1))