A group of people inside some form of public transportation (such as a bus), are looking out the windows on the left side.
A class heads out on a field trip
Not everyone that uses a bus is going on a field trip.
exists e1 s1 s2 x1 x2 x3 x4 x5 x6 x7.(n_side(x7) & a_left(s2) & Theme(s2,x7) & n_window(x6) & on(e1,x7) & out(e1,x6) & Actor(e1,x1) & v_look(e1) & of(x1,x2) & inside(x2,x3) & of(x3,x4) & n_such(x4) & as(x4,x5) & n_bus(x5) & n_transportation(x4) & a_public(s1) & Theme(s1,x4) & n_form(x3) & n_people(x2) & n_group(x1))
exists e1 s1 x1 x2 x3.(a_out(s1) & Manner(e1,s1) & on(e1,x2) & n_trip(x2) & of(x2,x3) & n_field(x3) & Actor(e1,x1) & v_head(e1) & n_class(x1))