(A) The child said that he would not kneel for if he did so he will spoil my new pair of trousers.
(B) The child said that he will not kneel for if he kneels he will spoil.
(C) The child said that he would not kneel for if he did so he would spoil his new pair of trousers.
(D) The child said that I will not kneel for if he should spoil his new pair of trousers.