Having a great day learning how to snowboard.
The boy is skiing.
Snowboarding and skiing are different activities.
exists e1 e2 s1 x1 x2 x3 x4.(Theme(e2,x2) & Actor(e2,x1) & v_have(e2) & Topic(e1,x4) & Actor(e1,x3) & v_learn(e1) & n_manner(x4) & exists e3 x5.(Actor(e3,x5) & v_snowboard(e3)) & (x2 = x3) & n_day(x2) & a_great(s1) & Theme(s1,x2) & n_thing(x1))
exists p1 x1.(n_boy(x1) & exists x2.((x1 = x2) & n_skiing(x2)))