Men fish on a concrete slab.
Men are fishing for trout.
Men fish on a concrete slab doesn't infer that they are fishing for trout.
exists s1 x1 x2 x3.(a_topic(x1) & on(x1,x3) & n_slab(x3) & a_concrete(s1) & Theme(s1,x3) & n_fish(x1) & of(x1,x2) & n_man(x2))
exists e1 x1 x2.(for(e1,x2) & n_trout(x2) & Actor(e1,x1) & v_fish(e1) & n_man(x1))