A woman with a floral shirt and purse and a man with a black shirt are walking while another man walks behind them.
The woman and man are walking together.
walking  doesn't always  together.
exists e1 p1 s1 s2 x1 x2 x3 x4 x5 x6 x7.(exists e2 x8.(behind(e2,x2) & Actor(e2,x8) & v_walk(e2) & n_man(x8) & -(x8 = x6)) & n_thing(x2) & n_man(x6) & n_man(x6) & while(e1,p1) & Actor(e1,x1) & v_walk(e1) & subset_of(x6,x1) & with(x6,x7) & n_shirt(x7) & a_black(s2) & Theme(s2,x7) & subset_of(x2,x1) & with(x2,x3) & n_purse(x5) & n_shirt(x4) & subset_of(x5,x3) & subset_of(x4,x3) & a_floral(s1) & Theme(s1,x3) & n_woman(x2))
exists e1 s1 x1 x2 x3.(n_man(x3) & n_woman(x2) & subset_of(x3,x1) & subset_of(x2,x1) & a_together(s1) & Manner(e1,s1) & Actor(e1,x1) & v_walk(e1))