GAO's prior work on best practices covers achieving the first knowledge point.
( ( ( ( GAO 's ) ( prior work ) ) ( on ( best practices ) ) ) ( ( covers ( achieving ( the ( first ( knowledge point ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (NNP GAO) (POS 's)) (JJ prior) (NN work)) (PP (IN on) (NP (JJS best) (NNS practices)))) (VP (VBZ covers) (S (VP (VBG achieving) (NP (DT the) (JJ first) (NN knowledge) (NN point))))) (. .)))
GAO doesn't know the best practices for the first knowledge point.
( GAO ( ( ( does n't ) ( know ( ( the ( best practices ) ) ( for ( the ( first ( knowledge point ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP GAO)) (VP (VBZ does) (RB n't) (VP (VB know) (NP (NP (DT the) (JJS best) (NNS practices)) (PP (IN for) (NP (DT the) (JJ first) (NN knowledge) (NN point)))))) (. .)))