Half step down
Play this in beginning, first verse and in chorus.

e-------------
B---------4---
G------1--3---
D-3----1--1---
A-1-----------
E-------------

verse (except 1st verse, you will cont. this in the middle of the 1st verse)
Repeat this over and over again in the verses.
e-----------------------------------------------------------
B-----------------------------4-----------4-4-----------4---
G---------------------------1-3-----------3-3-----------3---
D-3-----------3-3-----------1-1-----------1-1-----------1---
A-1--1x-1x-1x-1-1--1x-1x-1x------1x-1x-1x------1x-1x-1x-----
E-----------------------------------------------------------

Pre-chorus
e---------------------------------
B---------------------------------
G-------3------3-----------3------
D-----3-1-3----1-3-------3-1--6---
A-3---1---1-1x---1---3---1----4---
E-1------------------1------------