A crowd of people are standing no a busy sidewalk.
A group of people standing around alone waiting for the bus.
A crowd of people are standing next to a busy sidewalk doesn't imply they are alone.
exists e1 s1 s2 x1 x2 x3.(n_sidewalk(x3) & a_busy(s2) & Theme(s2,x3) & Time(e1,x3) & a_no(s1) & Manner(e1,s1) & Actor(e1,x1) & v_stand(e1) & of(x1,x2) & n_people(x2) & n_crowd(x1))
exists e1 e2 s1 x1 x2 x3 x4.(n_bus(x4) & a_topic(x1) & of(x1,x2) & around(e1,s1) & Theme(s1,x3) & a_alone(s1) & for(e1,e2) & for(e2,x4) & Actor(e2,x3) & v_wait(e2) & Actor(e1,x3) & v_stand(e1) & (x2 = x3) & n_people(x2) & n_group(x1))