This is a great song very simple straight forward the strum pattern changes in the songs 
and i will tell you when

Chords (in order of appearence)
A,A/G#,F#m,F(bar),G,D,C,C/B,Am,E7,Bm,Em (two things i prefer Baring the G and the second 
A that will come up after the G to bring it up and octive and this is not the 
progression there will be other chord reappearing in there and it changes in the song)

the first strum pattern is (D D U) when it get to F#m (D D) ( listen to song)
  A (x02220@1)   A/G# (402220@1)    F#me-0-0-0-0---0---0-2-2-------------| (244222@1)B-2-2-2-2---2---2-2-2-------------|
G-2-2-2-2---2---2-3-3-------------| (x3)
D-2-2-2-2---2---2-4-4-------------|
A-0-0-0-0---0---0-4-4-------------|
E-------4p0-4p2-0-2-2--0-h2-h4-p0-

(strum pattern D D) when it get to A (DUDUDDUDUD)
  F (133211@1) G (320003@1) Ae-1-1/3-3/5-5-5-5-5-5-5-5-5-5-5-| (x02220@1)B-1-1/3-3/5-5-5-5-5-5-5-5-5-5-5-|
G-2-2/4-4/6-6-6-6-6-6-6-6-6-6-6-|
D-3-3/5-5/7-7-7-7-7-7-7-7-7-7-7-|
A-3-3/5-5-7-7-7-7-7-7-7-7-7-7-7-|
E-1-1/3-3/5-5-5-5-5-5-5-5-5-5-5-|

D (strum pattern DDUDDUDDDUDU)
e-2-
B-3-
G-2-
D-0-
A---
E---

strum pattern C DDU)C/B DDU)Am DDUDUDU:CHUCK IN BETWEEN EACH STRUM)
  C C/B Am
e-0-0---0-|
B-1-1---1-|
G-0-0---2-|
D-2-0---2-|
A-3-3---0-|
E---------|

Strum pattern ( DDDUDU)
  D (xx0232@1)name="chord_020130@1">E7
e-2-0
B-3-0
G-2-1
D-0-0
A---2
E---0

Repeat verse same rhythm

Repeat F G A D C C/B Am D E7 same rhythm and strum pattern

strum pattern G (DD) Bm (DD) Em (DDDUDU)
  G (320003@1)  Bm (x24432@1)name="chord_022000@1">Em
e-3----2--0----|
B-3(0)-3--0----|
G-0----4--0----|
D-0----4--2----|   X3
A-2----2--2----|
E-3----2--0----|

strum pattern DDDUDU
  D (xx0232@1)name="chord_020130@1">E7
e-2-0
B-3-0
G-2-1
D-0-0
A-0-2
E-0-0

Repeat for the rest of the song please rate or if you dont have an account please e mail 
and give me ur thoughts