This is an arrangement for solo acoustic that tries to mimic the instrumental parts in 
the song. I just did this by ear.
I recorded this here: (YOUTUBE) http://bit.ly/lOZ568  I used capo 2 on the recording, so 
it's in A instead of G, as the tab is.

Alternate up-down picking for these, pretty simple.

Intro/first part of first verse/2nd verse
e|---------------------------------|
B|---------------------------------|
G|--------------------0---0---0---0|
D|---5---5---5---5--0---2---4---5--|
A|-----0---2---3-------------------|
E|-3-------------------------------|

Second part of first verse (just a G major scale ascending)
e|---------------------------------|
B|---------------------------------|
G|---------------------------------|
D|------------------0---2---4---5--|
A|-----0---2---3-------------------|
E|-3-------------------------------|

Chorus:
Then I see you, you're walking 'cross the campus
Cruel professor studying romances
e|----------------------------------------------|
B|----------------------------------------------|
G|----------------------------------------------|
D|----------4-------------------------------4---|
A|---2------5------------3------------------5---|
E|---3-------------------5----------------------|

How am I supposed to pretend
That I never want to see you again
e|----------------------------------------------|
B|----------------------------------------------|
G|----------------------------------------------|
D|----------4-----------------------------------|
A|2---------5------------3----------------------|
E|3----------------------5----------------------|

2nd verse and second chorus same as before.

Interlude(3+3+2 strum pattern)
e|-----------------------------------------|
B|-----------------------------------------|
G|------------------------2----4-----------|
D|------------------------2----4-----------|
A|---5----3-----5----2----3----5---2-------|
E|---3----1-----3----3-------------3-------|

The afternoon, you're out on the stone and grass
e|-------------------------------------|
B|-------------------------------------|
G|----------2-----4--------------------|
D|----------2-----4--------------------|
A|---2------3-----5------2-------------|
E|---3-------------------3-------------|

Solo, if you can call it that.
e|---3----5---7---3---------|
B|--------------------------|
G|--------------------------|
D|--------------------------|
A|---2----3---5---2---------|
E|---3------------3---------|


Back to the intro for the ending.