The chords F  C  D  Bb C **in that order** are repeated throughout the whole song listen 
the song for strumming pattern...its fairly simple:

F       C        D
When I see your smile
Bb                     F
Tears roll down my face
   C        D       Bb
I can't replace

F                               C
And now that I'm strong I have figured out
           D                      Bb
how this world turns cold and it breaks through my soul
       F          C          D              Bb
and I know I'll find deep inside me, I can be the one

F             C
I will never let you fall
D                      Bb
I'll stand up for you forever
F                      C
I'll be there for you through it all
D                    Bb
Even if saving you sends me to heaven

Intro......

F                         C
Seasons are changing and waves are crashing
      D                Bb
and stars are falling all for us
F                      C
days grow longer and nights grow shorter
D                       Bb
   I can show you I'll be the one

F             C
I will never let you fall
D                        Bb
I'll stand up for you forever
F                       C
I'll be there for you through it all
D                   Bb
Even if saving you sends me to heaven

F
Cause you're my
C
You're my, my.....
D
My true love

My whole heart
Bb                      C
Please dont throw that away!

F                C
Cause I'm here, for you
D
Please don't walk away
Bb                     C
Please tell me you'll stay, stay....

(whole band comes in, guitars distorted)

F               C
Use me as you will,
D                            Bb
Pull my strings just for a thrill
F                   C
And I know I'll be okay
D                            Bb
Though my skies are turning grey


(repeat chorus until fade out)

Have fun!
P.S. it sounds a lot better with power chords