The boy is doing a handstand on the pavement.
The boy is doing a handstand at night.
The time is not always night.
exists e1 x1 x2 x3.(n_pavement(x3) & n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & on(x2,x3) & n_handstand(x2))
exists e1 x1 x2 x3.(n_boy(x1) & at(e1,x3) & n_night(x3) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_handstand(x2))