A man is swimming with a little boy who is wearing a life jacket.
A little boy is having fun with his father while swimming in a lake.
We don't know if the man swimming with the little boy is his father.
exists e1 e2 s1 x1 x2 x3 x4 x5.(with(e1,x2) & Theme(e2,x4) & Actor(e2,x3) & v_wear(e2) & n_jacket(x4) & of(x4,x5) & n_life(x5) & (x2 = x3) & n_boy(x2) & a_little(s1) & Theme(s1,x2) & Actor(e1,x1) & v_swim(e1) & n_man(x1))
exists e1 s1 x1 x2 x3 x4 x5.(in(e1,x5) & n_lake(x5) & while(e1,x4) & n_swimming(x4) & with(e1,x3) & n_father(x3) & of(x3,x1) & n_male(x1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_fun(x2) & n_boy(x1) & a_little(s1) & Theme(s1,x1))