A scuba diving class taking a picture during class time.
Some people are taking ski lessons.
Scuba diving takes place in water, while ski lessons take place on snow
exists e1 e2 x1 x2 x3 x4 x5 x6.(a_topic(x1) & during(e2,x5) & n_time(x5) & of(x5,x6) & n_class(x6) & Theme(e2,x4) & Actor(e2,x3) & v_take(e2) & n_picture(x4) & (x1 = x3) & n_class(x1) & Actor(e1,x1) & v_dive(e1) & of(x1,x2) & n_scuba(x2))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_lesson(x2) & a_ski(s1) & Theme(s1,x2) & n_people(x1))