a Guy driving the tractor with some people around him
The man knows how to drive a tractor.
In the first sentence talks about a guy driving a tractor, it doesn't say he know how to drive a tractor.
exists e1 s1 x1 x2 x3.(n_male(x2) & n_tractor(x2) & a_topic(s1) & with(e1,x3) & around(x3,x2) & n_people(x3) & Theme(e1,x2) & Actor(e1,x1) & v_drive(e1) & (s1 = x1) & ne_org_guy(s1))
exists e1 x1 x2.(n_man(x1) & Topic(e1,x2) & Actor(e1,x1) & v_know(e1) & n_manner(x2) & exists e2 x3 x4.(Theme(e2,x4) & Actor(e2,x3) & v_drive(e2) & n_tractor(x4)))