People are walking in the street while other people sit and have lunch.
Some people are eating
If they are having lunch, they are eating.
exists e1 p1 x1 x2 x5.(n_street(x2) & exists e2 e3 x3 x4 x6.(Theme(e3,x6) & Actor(e3,x4) & v_have(e3) & n_lunch(x6) & -(x4 = x5) & n_people(x4) & Actor(e2,x3) & v_sit(e2) & -(x3 = x1) & n_people(x3)) & n_people(x5) & n_people(x1) & n_people(x1) & while(e1,p1) & in(e1,x2) & Actor(e1,x1) & v_walk(e1))
exists e1 x1.(Actor(e1,x1) & v_eat(e1) & n_people(x1))