Adjustments being performed on a bicycle under a tent.
Adjustments not being performed on a bicycle
Its impossible that something is being done and not being done at the same time.
exists e1 x1 x2 x3 x4.(a_topic(x1) & under(e1,x4) & n_tent(x4) & on(e1,x3) & n_bicycle(x3) & Theme(e1,x2) & v_perform(e1) & (x1 = x2) & n_adjustment(x1))
exists x1 x2.(a_topic(x1) & -exists e1 x3.(on(e1,x3) & n_bicycle(x3) & Theme(e1,x2) & v_perform(e1)) & (x1 = x2) & n_adjustment(x1))