I didn't do a lot of reading.
( I ( ( ( did n't ) ( do ( ( a lot ) ( of reading ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBD did) (RB n't) (VP (VB do) (NP (NP (DT a) (NN lot)) (PP (IN of) (NP (NN reading)))))) (. .)))
Reading was not something that I did very often. 
( Reading ( ( ( ( was not ) something ) ( that ( I ( did ( very often ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Reading)) (VP (VBD was) (RB not) (NP (NN something)) (SBAR (IN that) (S (NP (PRP I)) (VP (VBD did) (ADVP (RB very) (RB often)))))) (. .)))