Two men riding a dirt bike and one is falling off into a mud puddle.
Two friends are riding dirt bike.
Two men riding a dirt bike and one is falling off into a mud puddle does not necessary that two friends are riding dirt bike.
exists e2 e1 s1 x1 x2 x3 x4 x5 x6 x7 x8.(into(e2,x7) & n_puddle(x7) & of(x7,x8) & n_mud(x8) & a_off(s1) & Manner(e2,s1) & Actor(e2,x1) & v_fall(e2) & subset_of(x6,x1) & n_thing(x6) & card_eq_1(x6) & subset_of(x2,x1) & Theme(e1,x4) & Actor(e1,x3) & v_ride(e1) & n_bike(x4) & of(x4,x5) & n_dirt(x5) & (x2 = x3) & n_man(x2) & card_eq_2(x2))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & of(x2,x3) & n_dirt(x3) & n_friend(x1) & card_eq_2(x1))