An Indian man is scratching the back of his head while thinking.
A man scratches his head.
scratching the back of his head  is a rephrasing of scratches his head
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.(Theme(e1,x2) & Actor(e1,x1) & v_scratch(e1) & n_head(x2) & of(x2,x1) & n_male(x1) & n_man(x1))