A group of people are on the beach in cold weather and are jumping simultaneously.
A group of people celebrating someone's birthday jump at the same time at the beach.
Jumping simultaneously does not imply celebrating someone's birthday.
exists e1 p1 s1 x1 x2 x3 x4 x5.(n_beach(x5) & a_simultaneously(s1) & Manner(e1,s1) & Actor(e1,x3) & v_jump(e1) & of(x3,x4) & n_people(x4) & n_group(x3) & exists s2 x6.(on(x1,x5) & in(x5,x6) & n_weather(x6) & a_cold(s2) & Theme(s2,x6)) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 s1 x1 x2 x3 x4 x5 x6 x7 x8.(n_beach(x8) & n_time(x7) & a_same(s1) & Theme(s1,x7) & a_topic(x1) & of(x1,x2) & Theme(e1,x5) & Actor(e1,x3) & v_celebrate(e1) & at(x5,x8) & at(x5,x7) & n_jump(x5) & of(x5,x6) & n_birthday(x6) & of(x5,x4) & n_person(x4) & (x2 = x3) & n_people(x2) & n_group(x1))