A man is sitting and a female is walking.
A man sits while a woman walks.
A female walks.
exists e1 e2 x1 x2.(Actor(e2,x2) & v_walk(e2) & n_female(x2) & Actor(e1,x1) & v_sit(e1) & n_man(x1))
exists e1 p1 x1.(exists e2 x2.(Actor(e2,x2) & v_walk(e2) & n_woman(x2)) & while(e1,p1) & Actor(e1,x1) & v_sit(e1) & n_man(x1))