A crowd of people on the sidewalk with a bus driving by.
A person sitting alone by an empty street
A crowd of people cannot be one person.
(x)
exists e1 s1 s2 x1 x2 x3.(a_topic(x1) & by(e1,x3) & n_street(x3) & a_empty(s2) & Theme(s2,x3) & a_alone(s1) & Manner(e1,s1) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_person(x1))