Um, I guess the time when I was four.
( Um ( , ( I ( ( guess ( ( the time ) ( when ( I ( was four ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Um)) (, ,) (NP (PRP I)) (VP (VBP guess) (NP (NP (DT the) (NN time)) (SBAR (WHADVP (WRB when)) (S (NP (PRP I)) (VP (VBD was) (NP (CD four))))))) (. .)))
The last time was probably when I was five.
( ( The ( last time ) ) ( ( ( was probably ) ( when ( I ( was five ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ last) (NN time)) (VP (VBD was) (ADVP (RB probably)) (SBAR (WHADVP (WRB when)) (S (NP (PRP I)) (VP (VBD was) (NP (CD five)))))) (. .)))