A child washes rocks in a small tub.
A child sings songs as he cleans rocks
We don't know if the child sings songs or not. He could be talking to someone or he could be silent.
exists e1 s1 x1 x2 x3.(in(e1,x3) & n_tub(x3) & a_small(s1) & Theme(s1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_wash(e1) & n_rock(x2) & n_child(x1))
exists e1 p1 x1 x2.(exists e2 x3.(Theme(e2,x3) & Actor(e2,x1) & v_clean(e2) & n_rock(x3)) & n_male(x1) & as(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_sing(e1) & n_song(x2) & n_child(x1))