I was surprised to find that this wasn't on here already; there are surprisingly 
few Foreigner tabs.  Anyway, here's my shot at it.

CAPO 1

Dm                              Bb  
Say you will, say you won't make up your mind tonight
C                                  Dm
Say you do, say you don't wanna be mine
Dm                              Bb   
Say you will, say you won't make up your mind this time
C                                 Dm
Say you will, say you will be mine tonight


Dm                          C
I can't sleep I keep dreaming I'm losing you
Bb              C                     Dm
Feel so alone in the night, scared to open my eyes
Dm                          C
I'm in too deep, I'm in over my head this time
Bb              C                     Dm
Can't get you out of my mind no matter how hard I try


                Dm                                       Bb  
So won't you say you will, say you won't make up your mind tonight
C                         Dm
Say you will, say you will be my guiding light
Dm                              Bb  
Say you will, say you won't make up your mind this time
C                               Dm
Say you do, say you do, you wanna be mine


Dm                                           C
I get the feeling, I've never been here before
Bb                                                   Dm
'Cause no one I've known's ever moved me the way that you do     
        C
And I know this is the real thing, it's all I've been searching for
        Bb                                                           Dm
I put it all on the line, now I'm hoping you feel that way too, and if you do


Dm                                       Bb 
Why don't you say you will, say you won't make up your mind tonight
C                         Dm
Say you do, say you don't wanna be mine
Dm                              Bb 
Now will you say you will, say you won't make up your mind this time
C                               Dm
Say you will, say you will, you'll be mine tonight


F                    Bb                 C
Will you tell me how much I mean to you
F                         Bb               C
Will you say you always will be true
F                      Bb       C
I need more than a come-on sign
Bb                                      C
So won't you say you will be mine


                Dm                                       Bb
Now won't you say you will, say you won't make up your mind tonight
C                         Dm
Say you will, say you will be my guiding light
Dm                              Bb 
Say you will, say you will make up your mind this time
C                               Dm
Say you do, say you do, you wanna be mine, come on come on
Dm                      Bb
Say you will make up your mind tonight
C                                 F Bb C
Say you will, say you will be mine tonight

F Bb C Bb