Thousands of Hoosier motorists have been doing just that by purchasing environmental license plates.
( ( Thousands ( of ( Hoosier motorists ) ) ) ( ( have ( been ( ( doing ( just that ) ) ( by ( purchasing ( environmental ( license plates ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Thousands)) (PP (IN of) (NP (NNP Hoosier) (NNS motorists)))) (VP (VBP have) (VP (VBN been) (VP (VBG doing) (NP (RB just) (DT that)) (PP (IN by) (S (VP (VBG purchasing) (NP (JJ environmental) (NN license) (NNS plates)))))))) (. .)))
Thousands of Hoosier motorists have not bought environmental license plates.
( ( Thousands ( of ( Hoosier motorists ) ) ) ( ( ( have not ) ( bought ( environmental ( license plates ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Thousands)) (PP (IN of) (NP (NNP Hoosier) (NNS motorists)))) (VP (VBP have) (RB not) (VP (VBN bought) (NP (JJ environmental) (NN license) (NNS plates)))) (. .)))