A youth with a black shirt that says "Asian Pacific 2007" plays a drum while sitting.
Someone is drumming.
A youth would imply that someone is playing the drums.
exists e1 p1 s1 x1 x2 x3 x4 x5.(ne_nam_pacific(x4) & n_date(x4) & a_date_year_2007(x4) & a_date_year_2007(x4) & (x4 = x5) & ne_nam_asian(x5) & a_topic(x1) & with(x1,x2) & exists e2 e3 x6.(while(e2,e3) & Actor(e3,x4) & v_sit(e3) & Theme(e2,x6) & Actor(e2,x4) & v_play(e2) & n_drum(x6)) & Topic(e1,p1) & Actor(e1,x3) & v_say(e1) & (x2 = x3) & n_shirt(x2) & a_black(s1) & Theme(s1,x2) & n_youth(x1))
exists e1 x1.(Actor(e1,x1) & v_drum(e1) & n_person(x1))