A group of people, some sitting and some standing, seem to be enjoying a sort of party, as there are streamers and balloons around them.
A group of people are at a party and are sad.
There is no way you can know that people who seem to be enjoying themselves are sad. People who are enjoying themselves appear happy.
exists e2 e1 p1 p2 x1 x2 x3 x4 x5 x6.(exists p3 x9 x10 x11 x12.((x9 = x10) & subset_of(x12,x10) & around(x12,x1) & n_balloon(x12) & subset_of(x11,x10) & n_streamer(x11)) & n_thing(x1) & as(e2,p2) & Topic(e2,p1) & Actor(e2,x1) & v_seem(e2) & exists e3 x7 x8.(Theme(e3,x7) & Actor(e3,x1) & v_enjoy(e3) & of(x7,x8) & n_party(x8) & n_sort(x7)) & rel(x1,x3) & subset_of(x6,x3) & n_standing(x6) & subset_of(x4,x3) & Actor(e1,x5) & v_sit(e1) & (x4 = x5) & n_thing(x4) & of(x1,x2) & n_people(x2) & n_group(x1))
exists p1 s1 x1 x2 x3 x4.(Theme(s1,x3) & a_sad(s1) & of(x3,x4) & n_people(x4) & n_group(x3) & exists x5.(at(x1,x5) & n_party(x5)) & of(x1,x2) & n_people(x2) & n_group(x1))