( This ( ( ( ( ( affects ( the ( learning speed ) ) ) , ) but ) ( ( does n't ) ( effect ( the ( different positions ) ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VP (VBZ affects) (NP (DT the) (NN learning) (NN speed))) (, ,) (CC but) (VP (VBZ does) (RB n't) (VP (VB effect) (NP (DT the) (JJ different) (NNS positions))))) (. .)))
This affects the learning speed, but doesn't effect the different positions.
(ROOT (S (NP (JJ Different) (NNS media)) (VP (VBP affect) (NP (NP (DT the) (NN speed)) (PP (IN of) (NP (NN light))))) (. .)))