A woman is playing tennis while sitting down in the grass.
A woman is stretching her legs out on the grass.
Playing tennis while sitting down doesn't necessarily imply stretching one's legs.
exists e1 e2 s1 x1 x2 x3.(n_grass(x3) & while(e1,e2) & in(e2,x3) & a_down(s1) & Manner(e2,s1) & Actor(e2,x1) & v_sit(e2) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_tennis(x2) & n_woman(x1))
exists e1 s1 x1 x2 x3.(n_grass(x3) & on(e1,x3) & a_out(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_stretch(e1) & n_leg(x2) & of(x2,x1) & n_female(x1) & n_woman(x1))