John Mayer - Dont Think Twice Its All Right Tab

  
E
 3 0 0 0 0 3 0                         E
 3 0 0 0 2 0 0 0 0 0 
  
B
 1 1 1 0 1 1 1                         B
 1 1 1 0 1 0 1 3 5 3 
  
G
 0 0 2 0 2 0 0                         G
 0 0 2 0 2 0 0 0 0 0 
  
D
 2 0 2 0 3 2 0  and the second part is D
 2 0 2 0 0 0 0 0 0 0 
  
A
 3 2 0 0 0 3 2                         A
 3 2 0 0 0 0 0 0 0 0 
  
E
 0 3 0 3 1 0 3                         E
 0 3 0 3 2 3 3 3 3 3 

and the last part is

  
E
 3 0 0 2 3 0 0 0 0 3 0 
  
B
 1 1 1 1 1 1 1 0 1 1 1 
  
G
 0 3 2 2 0 0 2 0 2 0 0 
  
D
 2 2 3 0 2 0 2 0 3 2 0 
  
A
 3 3 0 0 3 2 0 0 0 3 2 
  
E
 0 0 1 2 0 3 0 3 1 0 3 

and you just repeat that all through the song
he mostly uses his thumb on the low E string