A girl in a life jacket is swimming while others watch from the rocks.
A girl playing softball, alone.
The girl cannot be playing softball and swimming simultaneously. If there are others, she is not alone.
exists e1 p1 x1 x2 x3 x5.(n_rock(x5) & exists e2 x4.(from(e2,x5) & Actor(e2,x4) & v_watch(e2) & -(x4 = x1) & n_person(x4)) & n_person(x1) & while(e1,p1) & Actor(e1,x1) & v_swim(e1) & in(x1,x2) & n_jacket(x2) & of(x2,x3) & n_life(x3) & n_girl(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & r_alone(x3) & n_softball(x3) & (x1 = x2) & n_girl(x1))