A man scratching his arm while a girl sits at a table.
He is about to sit next to the girl.
Scratching an arm does not infer a need to sit.  The man might already be sitting.
exists e1 p1 x1 x2 x3.(a_topic(x1) & exists e2 x4 x5.(at(e2,x5) & n_table(x5) & Actor(e2,x4) & v_sit(e2) & n_girl(x4)) & while(e1,p1) & Theme(e1,x3) & Actor(e1,x2) & v_scratch(e1) & n_arm(x3) & of(x3,x1) & n_male(x1) & (x1 = x2) & n_man(x1))
exists p1 s1 x1 x2.(n_girl(x2) & n_male(x1) & Topic(s1,p1) & Actor(s1,x1) & a_about(s1) & exists e1 p2.(exists s2.(to(s2,x2) & Theme(s2,x1) & a_next(s2)) & Topic(e1,p2) & Actor(e1,x1) & v_sit(e1)))