( ( ( The ( main source ) ) ( of ( energy ( for ( ( ( almost all ) forms ) ( of life ) ) ) ) ) ) ( ( is ( the Sun ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ main) (NN source)) (PP (IN of) (NP (NP (NN energy)) (PP (IN for) (NP (NP (QP (RB almost) (DT all)) (NNS forms)) (PP (IN of) (NP (NN life)))))))) (VP (VBZ is) (NP (DT the) (NNP Sun))) (. .)))
The main source of energy for almost all forms of life is the Sun.
(ROOT (S (ADVP (RB Ultimately)) (, ,) (NP (JJS most) (NN life) (NNS forms)) (VP (VBP get) (NP (PRP$ their) (NN energy)) (PP (IN from) (NP (DT the) (NN sun)))) (. .)))