its really not that hard, really. Just 4 basic chords.
C, G, Am, and Em.

Heres the order:

VERSE:

C
And i.

C
And i thought it up and said

G                Am          C
A little bit longer and i'd be fine


CHORUS:

Am                   Em                G
But you don't know what you got 'til it's gone

Am                   Em                G
And you don't know what it's like to feel so low

Am                   Em                G
And everytime you smile or laugh you glow

                Am    Em     G    
You don't even know, know, know.

                Am
You don't even know.

REPEAT VERSE

REPEAT CHORUS


                Am    Em     G    
You don't even know, know, know.

                C
You don't even know.



Listen to the song for the strumming.
http://youtube.com/watch?v=0E48EgMkxr8