that's easy, there are four different chords, D Bm F#m throughout the whole son
then C#m just before the final chorus.
D
Thinking about the time we shared
Bm
And how I wasn't there
F#m
It hurt me, these people overworked me
keep on with this chords throughout the song then at the end:
D
S.O.S. to your ears
Bm C#m
The only thing I ever feared was this day
And having to say
that's all, for an acoustic version this sounds good, hope you'll enjoy it
cheers 