Two girls are sitting on a bench outside, and one of them is checking her cellphone.
the girls are outside
Girls plural,  implies more than one girl.
exists e1 e2 x1 x2 x3 x4 x5.(Theme(e2,x5) & Actor(e2,x4) & v_check(e2) & n_cellphone(x5) & of(x5,x2) & n_female(x2) & of(x4,x1) & n_thing(x1) & n_thing(x4) & card_eq_1(x4) & on(e1,x2) & n_outside(x2) & of(x2,x3) & n_bench(x3) & Actor(e1,x1) & v_sit(e1) & n_girl(x1) & card_eq_2(x1))
exists s1 x1.(n_girl(x1) & Theme(s1,x1) & a_outside(s1))