Three speed skaters skating.
Three people are taking off skates.
Skating cannot be done while taking off skates.
exists e1 x1 x2.(Actor(e1,x1) & v_skate(e1) & n_skater(x1) & of(x1,x2) & n_speed(x2) & card_eq_3(x1))
exists e1 s1 x1 x2.(a_off(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_skate(x2) & n_people(x1) & card_eq_3(x1))