There is one person sitting under an umbrella and two other sitting in the sun.
There are three people outside.
Sitting under an umbrella and sitting in the sun doesn't necessarily indicate the people are outside.
exists p1 x1 x8.(n_sun(x8) & exists e1 e2 x2 x3 x4 x5 x6 x7.((x1 = x2) & subset_of(x6,x2) & in(e2,x8) & Actor(e2,x7) & v_sit(e2) & (x6 = x7) & r_other(x6) & n_thing(x6) & card_eq_2(x6) & subset_of(x3,x2) & under(e1,x5) & n_umbrella(x5) & Actor(e1,x4) & v_sit(e1) & (x3 = x4) & n_person(x3) & card_eq_1(x3)))
exists p1 s1 x1.(a_outside(s1) & Manner(p1,s1) & exists x2.((x1 = x2) & n_people(x2) & card_eq_3(x2)))