The little boy swims under the water.
The little boy is trying to learn how to swim to be a life guard in the future.
The little boy swims under the water implies that he is not trying to learn how to swim.
exists s1 x1 x2 x3.(n_water(x3) & n_swim(x1) & of(x1,x2) & n_boy(x2) & a_little(s1) & Theme(s1,x1) & a_topic(x1) & under(x1,x3))
exists e1 p1 s1 x1 x2.(n_future(x2) & n_boy(x1) & a_little(s1) & Theme(s1,x1) & Topic(e1,p1) & Actor(e1,x1) & v_try(e1) & exists e2 p2 s2.(a_how(s2) & Manner(e2,s2) & Topic(e2,p2) & Actor(e2,x1) & v_learn(e2) & exists e3 p3.(Topic(e3,p3) & Actor(e3,x1) & v_swim(e3) & exists p4.(in(p4,x2) & exists x3 x4.((x1 = x3) & n_guard(x3) & of(x3,x4) & n_life(x4))))))