A boy in a gray shirt is skateboarding.
A boy is out skateboarding on a sunny day.
Just because a boy is skateboarding doesn't imply that he is outside or that it is sunny.
exists e1 s1 x1 x2.(Actor(e1,x1) & v_skateboard(e1) & in(x1,x2) & n_shirt(x2) & a_gray(s1) & Theme(s1,x2) & n_boy(x1))
exists e1 s1 s2 x1 x2.(a_out(s2) & Manner(e1,s2) & on(e1,x2) & n_day(x2) & a_sunny(s1) & Theme(s1,x2) & Actor(e1,x1) & v_skateboard(e1) & n_boy(x1))