this Gentleman is digging up rocks, or concrete, to make something in it's place.
A gentleman is using a jackhammer to remove concrete.
One can dig up rocks without necessarily using a jackhammer.
exists x1.(n_thing(x1) & n_gentleman(x1) & (exists e1 s1 x2.(a_up(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_dig(e1) & n_rock(x2)) | exists p1 p2 x3.(exists x5.((x3 = x5) & n_place(x5)) & Topic(x3,p1) & exists e2 x4.(Theme(e2,x4) & Actor(e2,x3) & v_make(e2) & in(x4,x1) & n_thing(x4)) & n_concrete(x3))))
exists e1 p1 x1 x2.(Theme(e1,p1) & Recipient(e1,x2) & Actor(e1,x1) & v_use(e1) & exists e2 x3.(Theme(e2,x3) & Actor(e2,x1) & v_remove(e2) & n_concrete(x3)) & n_jackhammer(x2) & n_gentleman(x1))