The boy in the red shirt is holding a rock.
The boy holds a rock.
"Is holding" is another way to say "holds".
exists e1 s1 x1 x2 x3.(n_shirt(x2) & a_red(s1) & Theme(s1,x2) & n_boy(x1) & Theme(e1,x3) & Actor(e1,x1) & v_hold(e1) & n_rock(x3) & in(x1,x2))
exists e1 x1 x2.(n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_rock(x2))