a young woman who knows how to hold the screen 
(ROOT (NP (NP (DT a) (JJ young) (NN woman)) (SBAR (WHNP (WP who)) (S (VP (VBZ knows) (SBAR (WHADVP (WRB how)) (S (VP (TO to) (VP (VB hold) (NP (DT the) (NN screen)))))))))))
(ROOT (NP (NP (DT ) (JJ ) (NN )) (SBAR (WHNP (WP )) (S (VP (VBZ ) (SBAR (WHADVP (WRB )) (S (VP (TO ) (VP (VB ) (NP (DT ) (NN )))))))))))