There's no bass for the entire first verse.

Tune down one whole step

Bass comes in at the first _chorus_:

F|-----------------------------------------|
C|-----------------5-55-7-77---------------|
G|--7-76-64-4-4-------------1-11-3-33------|
D|-------------5555------------------------|

Then, the second (and third) verse:

F-----------------------------------------------------|
C----------------------7--7-7-9-9-9-9-----------------|
G--7--7-6--6-4--4---------------------2-2-2-2-5-5-5-5-|
D-----------------5--5--------------------------------|

The last time you play the above (last one before the chorus):

F------------------------------------------------------|
C--------------------------7-------5-------------------|
G--7--7-6--6-4--4------5-5---5-3-3---3-2-2-2-2-5-5-5-5-|
D-----------------5--5---------------------------------|

Play the chorus again, then the _other chorus_:

F------------------------------------------------------------|
C--------------------------5-7--7-7-5---5--------------------|
G---------3--3-3-----3-5-7------------7---7--7-5-3-0-3-0-3-5-|
D--5--5-5--------5-5-----------------------------------------|

The bridge part, going into the third verse of ending the song:

F---------------------------------||---|
C---------------------------------||---|
G--2-2-2-2-2-2-2-2-0-0-0-0-0------||---|
D----------------------------0-3--||-0-|
                                     ^
                                 End of song only.

Oh, and one time, the very last repetition of the _other chorus_ part
during the second time its played, there is a variation that goes like
this:

F----------------------------------------------5-------------|
C--------------------------5--7--7-7-5---5-7-7---7-5---------| Then go into
G---------3--3-3-----3-5-7-------------7-------------7-6-5-3-| the above
D--5--5-5--------5-5-----------------------------------------| bridge part.