The main riff is pretty basic, just listen to the song to get the strumming pattern. It
is down, down up down, down up down.
v v ^ v v ^ v v ^ v
e|----------------------------|
B|----------------------------|
G|----------------------------|
D|----4--4-4-4--4-4-4--4-4-4--|
A|----4--4-4-4--4-4-4--4-4-4--|
E|----2--2-0-2--2-0-2--2-0-2--|
After that it is bass until the Chorus, which goes as follows
Bm
e|----77777777------------------|
B|----77777777------------------|
G|----88888888------------------|
D|----99999999--4--4-4-4--4-4-4-|
A|----99999999--4--4-4-4--4-4-4-|
E|----77777777--2--2-0-2--2-0-2-|
And then it goes to the Chorus outro
e|-------------|
B|-------------|
G|--6-6---/9---|
D|--6-6---/9---|
A|--4-4---/7---|
E|-------------|
The bass on this follows the guitar, and goes throughout the entire song.
G|--------------------------------------------|
D|--------------------------------------------|
A|--------------------------------------------|
E|2--2-0-2--2-0-2----7-7-7-7-7-7-7-7-2--2-0-2-|
and so on.