A boy is being waited on in a restaurant.
a girl is waited on at a deli
A boy is a different sex from a girl.
exists e1 x1 x2.(in(e1,x2) & n_restaurant(x2) & on(e1,x1) & n_boy(x1) & v_wait(e1))
exists e1 s1 x1 x2.(at(e1,x2) & n_deli(x2) & a_on(s1) & Manner(e1,s1) & Theme(e1,x1) & v_wait(e1) & n_girl(x1))