All barre chords; the / just mean to transition quickly between those chords.
D/F# is standard D with F# on the E string

Intro: D   G/D   D   G/D   A   D/A   A   D/A

Verse 1:
A       D/A  A       D/A
Cosy we are, Closer than Far
A       D/A              A
Sounds of Forever, Still Around
A          D/A  A         D/A
Lovers in Love, Just like We Are
A          D/A           A
Being a-part's a lone-ly sound
D               G/D      D       G/D
And when people ask how we stay together
D          G/D      D
I say you never let me down

Chorus: 
     G              D/F#      G       A
And you make it feel    like Christmas
G               D/F#          G       A 
Even when things    go wrong
G               D/F#         Em7
I hear the sound    of Christmas
             Asus2 A  Asus2 A
in your song
             D   G/D   D   G/D
All year long
                        A   D/A  A  D/A 
Yes, you know that it's true

Verse 2:
A       D/A  A       D/A
Look at the sun shinning on me
A       D/A              A
Nowhere could be a bet-ter place
D         Em/D D              Em/D
Lovers in Love that's what we are
D                Em/D D             Em/D   
When you're with me, it's Christmas Day

CHORUS

Verse 3: 
A       D/A  A       D/A
Look at us now, part of it all
A       D/A              A
In spite of it all, we're still around
D         Em/D D              Em/D
So wake up the kids, Put on some tea
D             Em/D D              Em/D
Light up the tree, it's Christmas day

CHORUS