If you want to play along with the track you have to use capo on 1st fret.
Verse:
D A
Oh Oh I, I was a silly boy
G Gm
Riding to danger's where i'd always run, above and is hurt
D
I wouldn't have done
Bm E
All the things that I've done
A D
If I knew, one day you would come
G Gm D
Now baby, now baby, now baby
[ Tab from: https://www.guitartabs.cc/tabs/b/bruno_mars/if_i_knew_crd.html ]
A D A
Oh oh I, I know it breaks your heart
G
To picture the only you wanna love
Gm
In somebody's elses arms
D
But I wouldn't have done
Bm E
All the things that I've done
A D
If I knew, one day you would come
G Gm D D7
Now baby, now baby, now baby
Bridge:
D Em F#
Ohh baby please
Bm
Lets leave the past behind us
F# Bm
So that we can go where love will find us, yeah will find us
E
I know once girls would leave me
G A
But I know that you believe me
D A
Baby I, I wish we were seventeen
G
So I could give you all the innocence
Gm
That you gave to me
D
No, I wouldnt have done
Bm E
All the things that I have done
A D
If I knew one day you would come
G Gm D
If I knew one day you would come
