You start building up with this:

E|-----------------------------|
B|-5-3-5-8-10-8--5-3-5-8-8-8-5-|
D|-----------------------------|
G|-----------------------------|
A|-----------------------------|
E|-----------------------------|

You play that twice and then you play this:

E|----------------------------|
B|----------------------------|
D|----------------------------|
G|----------------------------|
A|-2-0-2-5-7-5--2-0-2-5-5-5-2-|
E|----------------------------|

You play that twice too.


Verse goes like this: Am, C, G
And the chorus goes like this:

E|----------------------------|
B|----------------------------|
D|----------------------------|
G|----------------------------|
A|-2-0-2-5-7-5--2-0-2-5-5-5-2-|
E|----------------------------|

After you end second chorus you start building up with the G chord
and then the piano start to play. And you play something like this:

E|-----------|
B|-----------|
D|-----------|
G|------2----|
A|-3--3--3-3-|
E|-----------|

That's it. I hope it helped you. :)
By the way the rhtym guitar plays: Am, C, G
the whole song but not in the bridge. :)