Three children are on the floor playing with building blocks.
Children are playing with the blocks after nap time at preschool.
Children could be playing at other times of the day rather than after nap time, and they could also have been in a different setting rather than at preschool.
exists p1 x1 x2 x3.(n_playing(x2) & of(x2,x3) & n_floor(x3) & exists x4 x5.(on(x1,x2) & with(x2,x4) & n_block(x4) & of(x4,x5) & n_building(x5)) & n_child(x1) & card_eq_3(x1))
exists e1 x1 x2 x3 x4 x5.(n_block(x2) & at(e1,x5) & n_preschool(x5) & after(e1,x3) & n_time(x3) & of(x3,x4) & n_nap(x4) & with(e1,x2) & Actor(e1,x1) & v_play(e1) & n_child(x1))