In response to http://www.youtube.com/comment?lc=ZAIANj3dcI4S5iuRvzoUgH7OcRqE-OvAL4kEKm2iC6I

[INTRO]
Em

[VERSE]
Am F C
Am F C G
Am F C
Am F C G

[PRE-CHORUS]
Dm F C G
Dm F C G

[CHORUS]
Am F C
Am F C G
Am F C
Am F C G

[VERSE]
Am F C
Am F C G
Am F C
Am F C G

[PRE-CHORUS]
Dm F C G
Dm F C G

[CHORUS]
Am F C
Am F C G
Am F C
Am F C G

[OUTRO]
Dm F C G
Dm (F) C G
C

Basically, you are doing Am F C, with a G on every second chord progression loop, or whatever it is called, then in the pre-chorus, and outro, you change the Am to a Dm and do the same. On the third last line, the F is optional. Then end on a C.