Use the "normal chords" on verse and bridge. When the chorus breaks, use the open chords 
pointed out below.

Standard tuning

Verse:

C# (x43121@1)  B (x2444x@1)  E (022100@1)  A (x02220@1)Bridge:

C# (x43121@1)  B (x2444x@1)  E (022100@1)  A (x02220@1)Chorus:

C# (x43121@1)  B (x2444x@1)  E (022100@1)  A (x02220@1)Open Chords used:

C# (x43121@1)  -     [x 4 6 6 5 0]

B (x2444x@1)   -     [0 9 9 8 0 0]

E (022100@1)   -     [0 7 9 9 0 0]

A (x02220@1)   -     [0 7 7 6 0 0]