Listen to the song to figure out the rhythm.
-Harris-

Intro             Verse
|-------------------------------------------------------------------------------|
|-------------------------------------------------------------------------------|
|----4------------4-4-4---7---6---------6---7---------5---6-------------7---6---|
|----4-x20--------4-4-4---7---6--7-7-7--6---7--5-5-5--5---6--4-4-4-4----7---6---|
|----2------------2-2-2---5---4--7-7-7--4---5--5-5-5--7---4--4-4-4-4----5---4---|
|--------------------------------5-5-5---------3-3-3---------2-2-2-2------------|

Keep strumming this chord      

Bridge
|-------------------------------------------------------------------------|
|-------------------------------------------------------------------------|
|---4-4-4---7---6----------------7---6-------4-----------------------------|
|---4-4-4---7---6---7--4-----5---7---6---7---4-----------------------------|
|---2-2-2---5---4---7--4-----5---5---4---7---2-----------------------------|
|------------------5--2-----3-----------5---------------------------------|
 
Chorus
|-------------------------------------------------------------------------|
|-------------------------------------------------------------------------|
|-----4-------------------------------------------------------------------|
|-----4-----5----7----4---------------------------------------------------|
|-----2-----5----7----4---------------------------------------------------|
|-----------3----5----2---------------------------------------------------|

Song Progression is:
Intro
Verse x2
Bridge x2
Verse x2
Chorus x2
Verse x2
Bridge x2
Verse x2

-------------------------------------------------------------------------------