How to play Complicated by Avril Lavigne

Tutorial video (Chords+Strumming pattern). A request. I hope this video will help you a little. ;)

Chords:

Intro: Dm, Bb(=A#), F, C
Verse: F, Dm, Bb, C
Prechorus (Bridge): Bb, Dm, C
Chorus:Dm, Bb, F, C, Gm (G?)

For intro strumming:

On Dm, strum: Down, Down, Up Up
On Bb(=A#), strum: Down, Up Down Up
On F, strum: Down, Down, Up Up
On C, strum: Down, Up Down Up