Someone wearing black shirt and shorts and another wearing gray top and jeans skirts are walking their dogs.
Dogs swimming in the ocean catching a ball.
Someone and another refer to persons, not dogs. Also, swimming and walking cannot be simultaneously done.
exists e1 e3 e4 e2 s1 s2 s3 x1 x2 x3 x4 x5 x6 x7 x8 x9 x10 x11 x12 x13 x14.(Theme(e4,x14) & Actor(e4,x1) & v_walk(e4) & n_dog(x14) & of(x14,x2) & n_thing(x2) & subset_of(x11,x1) & n_skirt(x12) & of(x12,x13) & n_jeans(x13) & n_top(x8) & subset_of(x12,x11) & subset_of(x8,x11) & a_gray(s3) & Theme(s3,x11) & Actor(e3,x11) & v_wear(e3) & -(x11 = x7) & n_skirt(x9) & of(x9,x10) & n_jeans(x10) & subset_of(x9,x7) & subset_of(x8,x7) & a_gray(s2) & Theme(s2,x7) & Actor(e2,x7) & v_wear(e2) & subset_of(x2,x1) & Theme(e1,x4) & Actor(e1,x3) & v_wear(e1) & n_shorts(x6) & n_shirt(x5) & subset_of(x6,x4) & subset_of(x5,x4) & a_black(s1) & Theme(s1,x4) & (x2 = x3) & n_person(x2))
exists e1 x1 x2 x3 x4 x5.(n_ocean(x3) & a_topic(x1) & in(x1,x3) & Theme(e1,x5) & Actor(e1,x4) & v_catch(e1) & n_ball(x5) & (x3 = x4) & n_swimming(x1) & of(x1,x2) & n_dog(x2))