Through a friend who knows the lift boy here.
( ( Through ( ( a friend ) ( who ( ( knows ( the ( lift boy ) ) ) here ) ) ) ) . )
(ROOT (FRAG (PP (IN Through) (NP (NP (DT a) (NN friend)) (SBAR (WHNP (WP who)) (S (VP (VBZ knows) (NP (DT the) (NN lift) (NN boy)) (ADVP (RB here))))))) (. .)))
Through my friend has not yet met the lift boy here.
( ( Through ( my friend ) ) ( ( ( ( ( has not ) yet ) ( met ( the ( lift boy ) ) ) ) here ) . ) )
(ROOT (SINV (PP (IN Through) (NP (PRP$ my) (NN friend))) (VP (VBZ has) (RB not) (ADVP (RB yet)) (VP (VBN met) (NP (DT the) (NN lift) (NN boy)))) (NP (RB here)) (. .)))