The scuba diver is underwater.
The scuba diver gives lessons.
The scuba diver is not implied to be giving lessons.
exists p1 x1 x2.(n_diver(x1) & of(x1,x2) & n_scuba(x2) & exists x3.((x1 = x3) & n_underwater(x3)))
exists e1 x1 x2 x3.(n_diver(x1) & of(x1,x2) & n_scuba(x2) & Theme(e1,x3) & Actor(e1,x1) & v_give(e1) & n_lesson(x3))