The problem is he plays it with his guitar tuned to F. Most guitars are tuned to E, so when you play it the song will sound a bit off but you may not be able to tell why.
Also checked out the tabs and they are all screwed up.
Start with a G chord. (I'm assuming you know the G) and strum the rhythm of the tune. (count 1, 2, 3, )
Then keep the same chord shape, but on the 4th beat just move your pointer finger down to the second fret on the low E string (fattest string) for one strum.
That's the first bar.
Then, keeping the same shape on the smaller strings (they stay there for the whole verse) make the E minor shape with your other fingers and strum for 1, 2, 3, 4.
(E minor is second fret on both the A and D strings, second and third strings from the fattest)
That's the second Bar.
Repeat this four times
Then, the second half of the verse is identical, but you shift your bass fingers up one string so it looks like a G, but one string up. Repeat this pattern
If this sounds all screwed up maybe it's one of those have to see it kinda things?
Try tuning your guitar up to F (one semitone if you have a tuner) and play along with the CD and it will make a lot more sense.
If you can decipher this and it worked, I'll fill you in on the chorus.
Good luck!
Chords below if it helps
Verse
G, Em, G, Em, C, Am, C, am
G, Em, G, Em, C, Am, C, Am
G, Em, G, Em, C, Am, C, Am, C, Am
Chorus
G, D, Am, C
G, D, Am, C
G, D, Am, C
G, D, Am, C
Verse 2
G, Em, G, Em, C, Am, C, am
G, Em, G, Em, C, Am, C, Am
Chorus 2
G, D, Am, C
G, D, Am, C
G, D, Am, C
G, D, Am, C
Piano Middle 8
(same as Vs)
etc, etc