he first stuff is correct i know it cause u can play it along with the song
first this starts 00:02
[ Tab from: http://www.guitartabs.cc/tabs/n/natasha_bedingfield/unwritten_tab.html ]
E|--4---5\4--4\2--2\0-----------------------------------|
B|------------------------------------------------------|
G|------------------------------------------------------| 12x
D|------------------------------------------------------|
A|------------------------------------------------------|
E|------------------------------------------------------|
the this 00:33
E|--5\4--4\2--2-----------------------------------------|
B|------------------------------------------------------|
G|------------------------------------------------------| 7x
D|------------------------------------------------------|
A|------------------------------------------------------|
E|------------------------------------------------------
|