Just repeat this through the song
       E        Am        E         Am
E|----------------------------------------|
B|---------------------------------1---1--|
G|---1---1-----2---2-----1---1-----2---2--|
D|---2---2-----2---2-----2---2---2----2---|
A|-2----2----0----0----2----2-------------|
E|----------------------------------------|

Every once in a while change the Am to C     
 
       C
E|-----------------|
B|-----------------|
G|---0---0---------|
D|---2---2---------|
A|-3----3----------|
E|-----------------|