( ( ( Stir mixture ) ( until sugar ) ) ( ( is dissolved ) . ) )
(ROOT (S (NP (NP (JJ Stir) (NN mixture)) (PP (IN until) (NP (NN sugar)))) (VP (VBZ is) (VP (VBN dissolved))) (. .)))
Stir mixture until 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))))))) (. .)))