A group of people are either standing or sitting, some are wearing hats and scarves, while some are not.
A boy is surfing.
A group is more than one boy.  One cannot be standing or sitting while also surfing.  One does not engage in surfing while wearing hats and scarves.
(exists e1 s1 x1 x2.(a_either(s1) & Manner(e1,s1) & Actor(e1,x1) & v_stand(e1) & of(x1,x2) & n_people(x2) & n_group(x1)) | exists e2 e3 p1 x3 x4 x5 x6 x7.(while(e3,e2) & exists x8.(-exists e4.(Actor(e4,x8) & v_be(e4)) & n_thing(x8)) & while(e3,p1) & Theme(e3,x5) & Actor(e3,x4) & v_wear(e3) & subset_of(x7,x5) & n_scarf(x7) & subset_of(x6,x5) & n_hat(x6) & n_thing(x4) & Actor(e2,x3) & v_sit(e2) & n_thing(x3)))
exists e1 x1.(Actor(e1,x1) & v_surf(e1) & n_boy(x1))