A line forms outside a mobile sharping truck with various items in hand.
A single person sits in a chair.
A single person cannot form a line, as a line consists of multiple people.  One does not sit in a chair while in line.
exists s1 s2 x1 x2 x3 x4 x5 x6.(a_topic(x1) & outside(x1,x3) & with(x3,x5) & in(x5,x6) & n_hand(x6) & n_item(x5) & a_various(s2) & Theme(s2,x5) & n_truck(x3) & of(x3,x4) & n_sharping(x4) & a_mobile(s1) & Theme(s1,x3) & n_form(x1) & of(x1,x2) & n_line(x2))
exists e1 s1 x1 x2.(in(e1,x2) & n_chair(x2) & Actor(e1,x1) & v_sit(e1) & n_person(x1) & a_single(s1) & Theme(s1,x1))