A guy typing on a laptop computer.
An author works on his next best-selling novel
A guy is not necessarily an author,  Someone typing is not necessarily typing a best selling novel.
exists e1 s1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_computer(x3) & a_laptop(s1) & Theme(s1,x3) & Actor(e1,x2) & v_type(e1) & (x1 = x2) & n_guy(x1))
exists e1 s1 s2 x1 x2.(on(e1,x2) & n_novel(x2) & a_best-selling(s2) & Theme(s2,x2) & a_next(s1) & Theme(s1,x2) & of(x2,x1) & n_male(x1) & Actor(e1,x1) & v_work(e1) & n_author(x1))