A boy in a pink T-shirt is riding a bike over a sand pile while two others are riding in the street.
The boy and his friends are outside.
Two boys who are riding in the street need not necessarily be FRIENDS with a boy who is riding a bike over a sand pile.
exists e1 p1 s1 x1 x2 x3 x4 x5 x7.(n_street(x7) & exists e2 x6.(in(e2,x7) & Actor(e2,x6) & v_ride(e2) & -(x6 = x1) & n_person(x6) & card_eq_2(x6)) & n_person(x1) & while(e1,p1) & over(e1,x4) & n_pile(x4) & of(x4,x5) & n_sand(x5) & Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & n_bike(x3) & in(x1,x2) & n_t-shirt(x2) & a_pink(s1) & Theme(s1,x2) & n_boy(x1))
exists s1 x1 x2 x3.(n_friend(x3) & of(x3,x2) & n_male(x2) & n_boy(x2) & Theme(s1,x1) & a_outside(s1) & subset_of(x3,x1) & subset_of(x2,x1))