A bearded man in a black t-shirt sits in front of a desk holding a computer.
A man buying a new laptop.
Sitting in front of a desk holding a computer doesn't imply that he is buying it. A computer may not be a laptop.
exists e2 e1 s1 s2 x1 x2 x3 x4 x5.(for(e1,e2) & Theme(e2,x5) & Actor(e2,x1) & v_hold(e2) & n_computer(x5) & in(e1,x3) & of(x3,x4) & n_desk(x4) & n_front(x3) & Actor(e1,x1) & v_sit(e1) & in(x1,x2) & n_t-shirt(x2) & a_black(s2) & Theme(s2,x2) & n_man(x1) & a_bearded(s1) & Theme(s1,x1))
exists e1 s1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_buy(e1) & n_laptop(x3) & a_new(s1) & Theme(s1,x3) & (x1 = x2) & n_man(x1))