A man in a yellow shirt is on a roof hammering in shingles.
A guy hammers.
In both sentences, a man or guy uses his hammer.
exists p1 s1 x1 x2.(exists x3 x4 x5.(on(x1,x3) & in(x3,x5) & n_shingle(x5) & n_hammering(x3) & of(x3,x4) & n_roof(x4)) & in(x1,x2) & n_shirt(x2) & a_yellow(s1) & Theme(s1,x2) & n_man(x1))
exists x1 x2.(a_topic(x1) & Time(x1,x2) & n_hammer(x2) & n_guy(x1))