A: 5-7-7-6-5-5---------------|
D: 10-12-12-11-10-10  or  x-5-7-7-7-5-|
G: 3-5-5-4-3-3---------------|
C: 8-10-10-9-8-8   or  x-3-5-5-5-3----|

Intro and Chorus [and for verses 2 and 3 on piano in Complete Demos] (credit goes out to 
"behindmyglasses" from the bass tab):

E|---------------------------------|
B|---------------------------------|
G|---------------------------------|
D|---------------------------------|
A|-0-0-3-4-5-5-4-3-----1-2-3-3-2-1-|
E|-----------------3-3-------------| x2 for intro,

During the verse, nothing is played on guitar, but I shall include the bass tab (credit 
out to user "behindmyglasses" again, with a little bit of editing):
G|------------------|
D|------------------|
A|-0-0-5-5------3-3-|
E|---------3-3------|

That sums up what is being plucked, now I'll move onto the rest of the song. But please 
during the bridge from verse to chorus, there is a key change that I've yet to figure 
completely.

Verse 1:

I have little thing
It's probably just a fling
there's two girls I like a lot
I think they're really hot
I'm not sure if they know
how my love began to grow
it took a lot of time
right now it's solely mine

Verse 2:
(spoken) TO-DAY!
I drew a mural of the things I'd like to love
and where my heart subsides
is with two girls with great eyes

Bridge:

(spoken)
A    D      G                  C
     if they just give me a chance
    A                     D
I'd show them what they want
            G                 C
and teach them what they got
         A                    D                    G
and I'd tickle each and every one of their fancies
                  C
and I'd take the key to my heart
         A
and open it and let the love shine through

Chorus:
A             D        G             C
Mary Kate and Ashley I hope you understand
       A          D          G            C
that I love you a lot and I wanna be your man
            A  D
and I think
             G       C              A           D
that it'd be totally cool if I hung around your apartments
      G              C
and enrolled in your school

Verse 3:

            A   D
Mary Kate!
I saw you on TV
you dressed up like a bee
remind me of the time
how it's gone and it's gone and it's gone
it's sadness every day that passes without you
and I really wanna really wanna really wanna hold you both tight
and tell you you're mine but instead I sing

Chorus:
A             D        G             C
Mary Kate and Ashley I hope you understand
       A          D          G            C
that I love you a lot and I wanna be your man
            A  D
and I think
             G       C              A           D
that it'd be totally cool if I hung around your apartments
      G              C
and enrolled in your school

Complete Demo's only:
(spoken)
yeah...
I could play them a song
uhh.. there's probably hundreds of songs out there
hmm...
maybe I could play them two songs!
Yeah!
cus there's two of them!
yeah!

Chorus:
A             D        G             C
Mary Kate and Ashley I hope you understand
       A          D          G            C
that I love you a lot and I wanna be your man
            A  D
and I think
             G       C              A           D
that it'd be totally cool if I hung around your apartments
      G              C
and enrolled in your school


I know that life without you and you would be sad
I know it'd be bad

Chorus:
A             D        G             C
Mary Kate and Ashley I hope you understand
       A          D          G            C
that I love you a lot and I wanna be your man
            A  D
and I think
             G       C              A           D
that it'd be totally cool if I hung around your apartments
      G              C
and enrolled in your school

Chorus/Outro:

Chorus:
A             D        G             C
Mary Kate and Ashley I hope you understand
       A          D          G            C
that I love you a lot and I wanna be your man
            A  D
and I think
             G       C              A           D
that it'd be totally cool if I hung around your apartments
      G              C
and enrolled in your school


Key Change for plucking:
once you learn to love me life will be alright
once you learn to love me life will be alright