A boy in a white t-shirt is splashing in shallow water.
A boy who knows how to swim.
Not everyone who splashes in shallow water can swim.
exists e1 s1 s2 x1 x2 x3.(in(e1,x3) & n_water(x3) & a_shallow(s2) & Theme(s2,x3) & Actor(e1,x1) & v_splash(e1) & in(x1,x2) & n_t-shirt(x2) & a_white(s1) & Theme(s1,x2) & n_boy(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Topic(e1,x3) & Actor(e1,x2) & v_know(e1) & n_manner(x3) & exists e2 x4.(Actor(e2,x4) & v_swim(e2)) & (x1 = x2) & n_boy(x1))