A boy in a gray sweatshirt is laughing while someone helps him put his foot over his head.
A boy in a grey shirt is doing yoga.
Just because the boy is putting his foot over his head, that doesn't mean he is doing yoga.
exists e1 p1 s1 x1 x2 x4 x5.(exists e2 p2 x1 x3.(exists e3.(over(e3,x5) & Theme(e3,x4) & Actor(e3,x1) & v_put(e3)) & n_male(x1) & n_male(x1) & Recipient(e2,p2) & Actor(e2,x3) & Topic(e2,x1) & v_help(e2) & n_person(x3)) & n_head(x5) & of(x5,x1) & n_foot(x4) & of(x4,x1) & n_male(x1) & while(e1,p1) & Actor(e1,x1) & v_laugh(e1) & in(x1,x2) & n_sweatshirt(x2) & a_gray(s1) & Theme(s1,x2) & n_boy(x1))
exists e1 x1 x2 x3 x4.(Theme(e1,x4) & Actor(e1,x1) & v_do(e1) & n_yoga(x4) & in(x1,x2) & n_shirt(x2) & of(x2,x3) & n_grey(x3) & n_boy(x1))