that this should seal the deal 
(ROOT (SBAR (IN that) (S (NP (DT this)) (VP (MD should) (VP (VB seal) (NP (DT the) (NN deal)))))))
(ROOT (SBAR (IN ) (S (NP (DT )) (VP (MD ) (VP (VB ) (NP (DT ) (NN )))))))