A balloon vendor stands in the street while motorcycles drive by.
A man tries to sell balloons at a state fair.
A balloon vendor is not necessarily a man.  Motorcycles driving by does not imply a state fair.
exists e1 s1 x1 x2 x3 x4 x5.(n_street(x3) & a_by(s1) & Manner(e1,s1) & while(e1,x4) & n_drive(x4) & of(x4,x5) & n_motorcycle(x5) & in(e1,x3) & Actor(e1,x1) & v_stand(e1) & n_vendor(x1) & of(x1,x2) & n_balloon(x2))
exists e1 p1 x1.(Topic(e1,p1) & Actor(e1,x1) & v_try(e1) & exists e2 x2 x3 x4.(Theme(e2,x2) & Actor(e2,x1) & v_sell(e2) & at(x2,x3) & n_fair(x3) & of(x3,x4) & n_state(x4) & n_balloon(x2)) & n_man(x1))