These are the chords (without going into too much detail). I've put backwards 
slashes (\) to indicate the count on each chord according to the quick strum 
pattern of the song. It's pretty simple.

Intro
-----
G \ \ \ \ \ \ \
G \ \ \ \ \ \ \

Verse
-----
G  \ \ \ \  \ \ \
G  \ \ \ Am \ \ Em
Em \ \ \ \  \ \ \
Em \ \ F \  \ \ Em

Last repeat is 12 counts of G only

Chorus
------
Bm \ \ \ C \ \ G
G  \ \ \ \ \ \ \
Bm \ \ \ C \ \ G
G  \ \ \ \ \ \ \ 
Em \ \ \ C \ \ G
G  \ \ \ \ \ \ \ 

Am   \ \ \ \ \ \ \
Em   \ \ \ \ \ \ \
D/F# \ \ \ \ \ \ \
Am

Verse
Chorus

Middle 8
--------
C  \ \ \ \ \ \ \
Em \ \ \ \ \ \ \
C  \ \ \ \ \ \ \
G  \ \ \ \ \ \ \
C  \ \ \ \ \ \ \
Em \ \ \ \ \ \ \ (guitar scratches and harms)
C  \ \ \ \ \ \ \
C  \ \ \ \ \ \ \

Guitar break
------------
Bm \ \ C \ \ \ \
G  \ \ \ \ \ \ \

(Repeat x4)

Chorus
------
Bm \ \ \ C \ \ G
G  \ \ \ \ \ \ \
Bm \ \ \ C \ \ G
G  \ \ \ \ \ \ \ 
Em \ \ \ C \ \ G
G  \ \ \ \ \ \ \ 

Am   \ \ \ \ \ \ \
Em   \ \ \ \ \ \ \

Bm \ \ \ C \ \ G
G  \ \ \ \ \ \ \
Bm \ \ \ C \ \ G
G  \ \ \ \ \ \ \ 
Em \ \ \ C \ \ G
G  \ \ \ \ \ \ \ 

Am   \ \ \ \ \ \ \
Em   \ \ \ \ \ \ \
Am   \ \ \ \ \ \ \
Em   \ \ \ \ \ \ \
D/F# \ \ \ \ \ \ \
Am

Outro
-----
G \ \ \ \ \ \ \ \
(repeat x4)