A man is using a jackhammer to work on a sidewalk.
A man is getting ready to take a lunch break.
One can't assume that a man using a jackhammer to work on a sidewalk is getting ready to take a lunch break.
exists e1 p1 x1 x2.(Theme(e1,p1) & Recipient(e1,x2) & Actor(e1,x1) & v_use(e1) & exists e2 x3.(on(e2,x3) & n_sidewalk(x3) & Actor(e2,x1) & v_work(e2)) & n_jackhammer(x2) & n_man(x1))
exists e1 p1 x1.(exists p2 s1.(Topic(s1,p2) & Actor(s1,x1) & a_ready(s1) & exists e2 x2 x3.(Theme(e2,x2) & Actor(e2,x1) & v_take(e2) & n_break(x2) & of(x2,x3) & n_lunch(x3))) & Topic(e1,p1) & Actor(e1,x1) & v_get(e1) & n_man(x1))