Sorry about the really short tab but I have just typed this during an high school lesson 
standard tuning -eadgbe 
 
the main riffs are listed here 
 
 G          Cadd9 D 
e---3------        --3------2----- 
b-----3----       ---3-------3--- 
g-------0-   x2 ----0---------2 
d---------0       -----0-0------- repeated many times 
a----------         -3------------- 
e-3--------       ---------------- 
 
 
then it is the same string pattern with the bridge 
 
with this cord pattern 
 
G  C  G  C 
 
then it is back to the main riff 
 
G G  Cadd9 D 
G G  Cadd9 D 
then the next d chord has an alteration and is to be played s slowly near the D 
G G Cadd9 D 
          --2--2------- 
          -------3------ 
          ------------2 
          -0----------- 
          -------------- 
          -------------- 
 
then end with a single slow strum of G 
 
Gotta go recess bell went