A man with a white hat and a tool belt who is working on the roof.
A man on the roof has a tool belt with a hammer and a wrench.
Working on the roof is not always done with a hammer and a wrench.
exists e1 s1 x1 x2 x3 x4 x5 x6 x7.(n_roof(x7) & a_topic(x1) & with(x1,x2) & subset_of(x4,x2) & on(e1,x7) & Actor(e1,x6) & v_work(e1) & (x4 = x6) & n_belt(x4) & of(x4,x5) & n_tool(x5) & subset_of(x3,x2) & n_hat(x3) & a_white(s1) & Theme(s1,x3) & n_man(x1))
exists e1 x1 x2 x3 x4 x5 x6 x7.(n_roof(x2) & Theme(e1,x3) & Actor(e1,x1) & v_have(e1) & with(x3,x5) & subset_of(x7,x5) & n_wrench(x7) & subset_of(x6,x5) & n_hammer(x6) & n_belt(x3) & of(x3,x4) & n_tool(x4) & on(x1,x2) & n_man(x1))