Doctor is performing a surgery.
Doctor is washing his hands preparing for surgery
The doctor would not be performing a surgery while he was washing his hands.
exists e1 x1 x2.(ne_nam_doctor(x1) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_surgery(x2))
exists e1 e2 x1 x2 x3.(ne_nam_doctor(x1) & for(e1,e2) & for(e2,x2) & n_surgery(x2) & Actor(e2,x1) & v_prepare(e2) & Theme(e1,x3) & Actor(e1,x1) & v_wash(e1) & n_hand(x3) & of(x3,x2) & n_male(x2))