A person practicing how to sky on a sunny day.
The sun was out in full force on this sunny day.
A person can practice something without the sun being out.
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(x1) & on(e1,x4) & n_day(x4) & a_sunny(s2) & Theme(s2,x4) & to(e1,x3) & n_sky(x3) & a_how(s1) & Manner(e1,s1) & Actor(e1,x2) & v_practice(e1) & (x1 = x2) & n_person(x1))
exists s1 s2 s3 x1 x2 x3.(n_day(x3) & a_sunny(s3) & Theme(s3,x3) & n_sun(x1) & on(s1,x3) & in(s1,x2) & n_force(x2) & a_full(s2) & Theme(s2,x2) & Theme(s1,x1) & a_out(s1))