( ( For example ) ( , ( hummingbirds ( ( can ( be ( attracted ( to ( feeders ( with ( ( ( a mixture ) ( of ( ( 1 ( part sugar ) ) ( dissolved ( in ( 4 ( parts water ) ) ) ) ) ) ) ( -LRB- ( ( ( ( equivalent ( to ( ( a solution ) ( of ( ( ( 1/5 sugar ) and ) ( 4/5 water ) ) ) ) ) ) , ) ( by volume ) ) -RRB- ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN For) (NP (NN example))) (, ,) (NP (NNS hummingbirds)) (VP (MD can) (VP (VB be) (VP (VBN attracted) (PP (TO to) (NP (NP (NNS feeders)) (PP (IN with) (NP (NP (DT a) (NN mixture)) (PP (IN of) (NP (NP (CD 1) (NN part) (NN sugar)) (VP (VBN dissolved) (PP (IN in) (NP (CD 4) (NNS parts) (NN water)))))) (PRN (-LRB- -LRB-) (ADJP (JJ equivalent) (PP (TO to) (NP (NP (DT a) (NN solution)) (PP (IN of) (NP (NP (CD 1/5) (NN sugar)) (CC and) (NP (CD 4/5) (NN water)))))) (, ,) (PP (IN by) (NP (NN volume)))) (-RRB- -RRB-))))))))) (. .)))
For example, hummingbirds can be attracted to feeders with a mixture of 1 part sugar dissolved in 4 parts water (equivalent to a solution of 1/5 sugar and 4/5 water, by volume).
(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))))))) (. .)))