bass comes in a little way through the song listen to it to get the right timing.

G|--------------------------------------------------|
D|--------------------------------------------------|
A|--------------------------------------------------|    X 5
E|--999-000-999-000-555-000-555-000-----------------|

this is mostly played all the way through but it changes at the chorus slightly like below

G|--------------------------------------------------|
D|--------------------------------------------------|
A|--------------------------------------------------|    X 4
E|--999-000-999-000-555-000-3--2--------------------|

from this u can gather how the rest of the song goes cus its repeated till the final 
on the chorus version (only slightly different) which goes like this:

G|--------------------------------------------------|
D|--------------------------------------------------|
A|--------------------------------4-----------------|    X 1
E|--999-000-999-000-555-000-3--2--------------------|