The speaker is introducing the new products on a fair.
a speaker presents some products
If he is introducing the new products, he is presenting products.
exists e1 s1 x1 x2 x3.(n_product(x2) & a_new(s1) & Theme(s1,x2) & n_speaker(x1) & on(e1,x3) & n_fair(x3) & Theme(e1,x2) & Actor(e1,x1) & v_introduce(e1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_present(e1) & n_product(x2) & n_speaker(x1))