A man in a construction uniform is kneeling down.
A man kneels down while working on a highway.
A man can be doing many types of construction, not just working on a highway.
exists e1 s1 x1 x2 x3.(a_down(s1) & Manner(e1,s1) & Actor(e1,x1) & v_kneel(e1) & in(x1,x2) & n_uniform(x2) & of(x2,x3) & n_construction(x3) & n_man(x1))
exists e2 e1 s1 x1 x2.(while(e1,e2) & on(e2,x2) & n_highway(x2) & Actor(e2,x1) & v_work(e2) & a_down(s1) & Manner(e1,s1) & Actor(e1,x1) & v_kneel(e1) & n_man(x1))