Two girls are walking along the street and talking.
Two friends are heading to  school while chatting
The fact that the girls are walking along the street and talking doesn't imply that they are friends and heading to school.
exists e2 e1 x1 x2 x3.(n_street(x2) & Actor(e2,x3) & v_talking(e2) & n_girl(x3) & card_eq_2(x3) & along(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_girl(x1) & card_eq_2(x1))
exists e2 e1 x1 x2.(while(e1,e2) & Actor(e2,x1) & v_chat(e2) & to(e1,x2) & n_school(x2) & Actor(e1,x1) & v_head(e1) & n_friend(x1) & card_eq_2(x1))