A piece of heavy machinery sits in front of a hole.
The excavator has just struck a gas line while attempting to dig a foundation.
Just because the excavator sits in front of a hole, it does not mean that it has just struck a gas line. Nor is the hole necessarily the foundation of a structure.
exists e1 s1 x1 x2 x3 x4.(in(e1,x3) & of(x3,x4) & n_hole(x4) & n_front(x3) & Actor(e1,x1) & v_sit(e1) & of(x1,x2) & n_machinery(x2) & a_heavy(s1) & Theme(s1,x2) & n_piece(x1))
exists e2 e1 p1 s1 x1 x2 x3.(n_excavator(x1) & while(e1,e2) & Topic(e2,p1) & Actor(e2,x1) & v_attempt(e2) & exists e3 x4.(Theme(e3,x4) & Actor(e3,x1) & v_dig(e3) & n_foundation(x4)) & a_just(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_strike(e1) & n_line(x2) & of(x2,x3) & n_gas(x3))