A boy in black waves his arms while other people are behind him on a field.
A boy is eating ice cream while sitting down in the grass.
You cannot wave your arms while eating ice cream.
(x)
exists e1 e2 s1 x1 x2 x3 x4.(n_grass(x4) & while(e1,e2) & in(e2,x4) & a_down(s1) & Manner(e2,s1) & Actor(e2,x1) & v_sit(e2) & Theme(e1,x2) & Actor(e1,x1) & v_eat(e1) & n_cream(x2) & of(x2,x3) & n_ice(x3) & n_boy(x1))