One child sits while another one kneels as they talk to each other.
Two children are chatting together
One child sits while another one kneels are two children, and chatting is a form of talk.
exists e1 p1 x1 x2 x3.(n_thing(x2) & n_kneel(x2) & card_eq_1(x2) & exists e2.(all x4.(n_other(x4) -> to(e2,x4)) & Actor(e2,x2) & v_talk(e2)) & as(e1,p1) & while(e1,x3) & n_kneel(x3) & card_eq_1(x3) & -(x3 = x2) & Actor(e1,x1) & v_sit(e1) & n_child(x1) & card_eq_1(x1))
exists e1 p1 x1.(exists s1.(Theme(s1,x1) & a_together(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_chat(e1) & n_child(x1) & card_eq_2(x1))