Two boys swim on a sunny day.
The boys swim in the rain.
Boys can not swim in the rain on a sunny day.
exists e1 s1 x1 x2.(on(e1,x2) & n_day(x2) & a_sunny(s1) & Theme(s1,x2) & Actor(e1,x1) & v_swim(e1) & n_boy(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_rain(x2) & n_boy(x1) & in(e1,x2) & Actor(e1,x1) & v_swim(e1))