An Indian man is scratching the back of his head while thinking.
This guy has an itch.
Scratching the back of his head does not necessarily mean has an itch.
exists e2 e1 s1 x1 x2 x3.(n_head(x3) & of(x3,x2) & n_male(x2) & n_back(x2) & while(e1,e2) & Actor(e2,x1) & v_think(e2) & Theme(e1,x2) & Actor(e1,x1) & v_scratch(e1) & of(x2,x3) & n_man(x1) & a_indian(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_guy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_itch(x2))