A little boy is sitting down reading a book.
A boy is enjoying a novel his mother gave him.
Reading a book is not necessarily be a enjoying experience. Not every book is a novel. A boy is reading a book doesn't imply his mother gave the book.
exists e2 e1 s1 s2 x1 x2.(for(e1,e2) & Theme(e2,x2) & Actor(e2,x1) & v_read(e2) & n_book(x2) & a_down(s2) & Manner(e1,s2) & Actor(e1,x1) & v_sit(e1) & n_boy(x1) & a_little(s1) & Theme(s1,x1))
exists e2 e1 x1 x2 x3 x4.(Theme(e2,x2) & Actor(e2,x1) & v_enjoy(e2) & Recipient(e1,x1) & Theme(e1,x4) & Actor(e1,x3) & v_give(e1) & n_male(x1) & n_male(x1) & (x2 = x4) & n_mother(x3) & of(x3,x1) & n_novel(x2) & n_boy(x1))