'These are human lives.
( ` ( These ( ( are ( human lives ) ) . ) ) )
(ROOT (S (`` `) (NP (DT These)) (VP (VBP are) (NP (JJ human) (NNS lives))) (. .)))
Human lives are at stake 
( ( Human lives ) ( are ( at stake ) ) )
(ROOT (S (NP (NNP Human) (NNS lives)) (VP (VBP are) (PP (IN at) (NP (NN stake))))))