"Dookie"
Having a Blast

This is my first transcription so it's not perfect, but it isn't bad.
The tab doesn't show timing but it's easy to work out.

(A)Intro
|----------------------------|
|----------------------------|
|------------------------3---|
|--5-5-5-5-5-3-3-3-3-3-3-3-3-| } play 4 times
|--5-5-5-5-5-3-3-3-3-3-3-1-3-|
|--3-3-3-3-3-1-0-1-0-1-0---0-|

(B)Verse
|-----------|
|-----------|
|-----------|
|--5-5-5-5--| } play 8 times
|--5-5-5-5--|
|--3-3-3-3--|

|---------------------------------------------------|
|---------------------------------------------------|
|------------------------------------------5-5-5-5--|
|--3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-5-5-5-5-5-5-5-5--| \ play twice
|--3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-5-5-5-5-3-3-3-3--| / from (B)
|--1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-3-3-3-3----------|

(C)Chorus
|-------------------------------------------
|-------------------------------------------
|--7-7-7-7-7-7-7-7-7-7-7--------------------
|--7-7-7-7-7-7-7-7-7-7-5-5-5-5-5-5-5-5-5-5--
|--5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5--
|----------------------3-3-3-3-3-3-3-3-3-3--

-------------------------------------------|
-------------------------------------------|
--5-5-5-5-5-5-5-5-5-5----------------------|
--5-5-5-5-5-5-5-5-5-5-7-7-7-7-7-7-7-7-7-7--| } play twice
--3-3-3-3-3-3-3-3-3-3-7-7-7-7-7-7-7-7-7-7--|
----------------------5-5-5-5-5-5-5-5-5-5--|

(D)Bit that goes "to me it's nothing"
|-------------------------|
|-------------------------|
|-------------------------|
|--5-5-5-5-7-3-3-3-3-3-3--| } play 4 times
|--5-5-5-5-7-3-3-3-3-3-3--|
|--3-3-3-3-5-1-1-1-1-1-1--|

(E)Bridge
|----------------------------------------------------
|----------------------------------------------------
|----------------------------3----------3-3-3-3-3-3--
|--5-----------5-5-5-5-5-5---3----------3-3-3-3-3-3--
|--5-----------5-5-5-5-5-5---1----------1-1-1-1-1-1--
|--3-----------3-3-3-3-3-3---------------------------
   Do you ever think back    to another time
|---------------------------------------------------------------|
|---------------------------------------------------------------|
|------------------------------------3-3------------------------|
|--3----------------5-5-5-5-5-5------3-3---------3-3-------5----|
|--3----------------5-5-5-5-5-5------1-1---------3-3-------5----|
|--1----------------3-3-3-3-3-3------------------1-1-------3----|
   Did it bring you so down that you thought you lost your mind
|--------------------------------------------------------------------|
|--------------------------------------------------------------------|
|----------5-5-5-5----------------------------------3-3-3-3----------|
|--3-3-3-3-5-5-5-5-5-5-5-5-5-5-5-5--3-3-3-3-5-5-5-5-3-3-3-3-3-5-3-5--|
|--3-3-3-3-3-3-3-3-5-5-5-5-5-5-5-5--3-3-3-3-5-5-5-5-1-1-1-1-3-5-3-5--|
|--1-1-1-1---------3-3-3-3-3-3-3-3--1-1-1-1-3-3-3-3---------1-3-1-3--|

|------------------------------------------------------------|
|------------------------------------------------------------|
|----------5-5-5-5----------------------------------3-3-3-3--|
|--3-3-3-3-5-5-5-5-5-5-5-5-5-5-5-5--3-3-3-3-5-5-5-5-3-3-3-3--|
|--3-3-3-3-3-3-3-3-5-5-5-5-5-5-5-5--3-3-3-3-5-5-5-5-1-1-1-1--|
|--1-1-1-1---------3-3-3-3-3-3-3-3--1-1-1-1-3-3-3-3----------|

Play those bits in the following order:
A  B  C  D  B  C  D  E
I think part E is a bit dodgy but I don't think it is too far out