One girl, playing tennis on an orange tennis court.
A girl plays tennis by herself.
At least one girl is playing, but she isn't necessarily playing by herself.
exists e1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & on(e1,x4) & n_court(x4) & of(x4,x6) & n_tennis(x6) & of(x4,x5) & n_orange(x5) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_tennis(x3) & (x1 = x2) & n_girl(x1) & card_eq_1(x1))
exists e1 x1 x2.(by(e1,x1) & n_female(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_tennis(x2) & n_girl(x1))