A guy in white t-shirt on a mac computer.
A man wearing a gray t-shirt reading a book.
The shirt is either white or gray. One cannot read a book and use a computer simultaneously.
exists s1 s2 x1 x2 x3.(a_topic(x1) & on(x1,x3) & n_computer(x3) & a_mac(s2) & Theme(s2,x3) & in(x1,x2) & n_t-shirt(x2) & a_white(s1) & Theme(s1,x2) & n_guy(x1))
exists e1 e2 s1 x1 x2 x3 x4 x5.(a_topic(x1) & Theme(e2,x3) & Actor(e2,x2) & v_wear(e2) & Theme(e1,x5) & Actor(e1,x4) & v_read(e1) & n_book(x5) & (x3 = x4) & n_t-shirt(x3) & a_gray(s1) & Theme(s1,x3) & (x1 = x2) & n_man(x1))