A man in a tan jacket is walking under a dark bridge.
A man is waiting in a dentist's office.
The man could either be waiting or walking.  A dark bridge is generally not found in a dentist's office.
exists e1 s1 s2 x1 x2 x3.(under(e1,x3) & n_bridge(x3) & a_dark(s2) & Theme(s2,x3) & Actor(e1,x1) & v_walk(e1) & in(x1,x2) & n_jacket(x2) & a_tan(s1) & Theme(s1,x2) & n_man(x1))
exists e1 x1 x2 x3.(in(e1,x3) & n_office(x3) & of(x3,x2) & n_dentist(x2) & Actor(e1,x1) & v_wait(e1) & n_man(x1))