Two boys rollerblading.
Two boys rollerblade.
Rollerblading is plural of roller blade.
exists e1 x1.(Actor(e1,x1) & v_rollerblade(e1) & n_boy(x1) & card_eq_2(x1))
exists s1 x1 x2.(n_rollerblade(x1) & a_.(s1) & Theme(s1,x1) & of(x1,x2) & n_boy(x2) & card_eq_2(x1) & a_topic(x1))