There are a extra notes in between the chords that are easy to learn if you listen to the 
song

I'm not to sure about some of the lyrics in the second verse, if anyone knows them 
comment and tell me what they are.

capo 7th fret

Intro: C
(light strumming)
e|--0--0--0--0--0--------0--|
b|--1--1--1--1--1--------1--|
g|--0--0--0--0--0--------0--|4x(all the C's in the song are played like this)
d|--2--2--2--2--0h2-0h2--2--|
a|--3--3--3--3--3--------3--|
E|--0--0--0--0--0--------0--|

Verse:
C                  Am
if you should be
                     F
the last autumn leaf
                 C
hanging from the tree
                   Am
I'll still be here
                     F                     C
waiting on the breeze to bring you down to me.

Chorus:
Em                  F      Em
And if it takes forever,
                 Am      Em
forever it'll be.
                   F     G
And if it takes forever,
                C
forever it'll be.

C Em F G C
Em F G

Verse:
C                        Am
   And if you should be
                      F
the last seed in spring,
                  C
to puncture out a leaf
C                     Am
  I'll still be here
                   F
waiting on the rain
                       C
to warm your heart for me.

Chorus:
Em                  F      Em
And if it takes forever,
                 Am      Em
forever it'll be.
                   F     G
And if it takes forever,
                C
forever it'll be.

End on C.