( ( ( Stir ( the mixture ) ) ( until ( ( the sugar ) ( is dissolved ) ) ) ) . )
(ROOT (S (VP (VB Stir) (NP (DT the) (NN mixture)) (SBAR (IN until) (S (NP (DT the) (NN sugar)) (VP (VBZ is) (VP (VBN dissolved)))))) (. .)))
Stir the mixture until the sugar is dissolved.
(ROOT (S (NP (NP (NNP Sugar) (NNS crystals)) (VP (VBG dissolving) (PP (IN in) (NP (NN water))))) (VP (VBZ is) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (NP (DT the) (NN formation)) (PP (IN of) (NP (DT a) (NN mixture))))))) (. .)))