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                          SENTIMENTAL - Porcupine Tree
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These are the basic chords that I figured out from watching the acoustic video.
 

[Intro]  Am - F - Dm - E
[Verse]  Am - F - Dm - E
[Chorus] Am - Am - F - Dm 

Note: Following the Dm up with a Dsus2 sounds very satisfying for the chorus parts. Also keep in mind that
only the chorus is in 4/4. The rest of the song alternates between odd time signatures. Refer to the pro tab
for a better understanding of the patterns.

[Intro]  

Am - F - Dm - E
Am - F - Dm - E
(drums come in)
Am - F - Dm - E
Am - F - Dm - E

[Verse 1]

Am                   F
    I never wanna be old  
      Dm                    E
And I don't want dependents 
Am                    F
    It's no fun to be told 
         Dm                          E
That you can't blame your parents anymore 
Am                     F
    I'm finding it hard 
                     Dm   E
to hang from a star 
                     F
Don't wanna be 
                     Dm   
I don't wanna be old


[Chorus] 

Am             Am                        
    Sullen and bored the kids stay 
       F                               Dm
And in this way they wish away each day 
Am                Am                         
    Stoned in the mall the kids play 
       F                               Dm
And in this way they wish away each day

Am - Am - F - Dm
Am - Am - F - Dm

[Verse 2]

Am                   F
   I don't really know 
       Dm                  E
If I care what is normal
Am                      F
   And I'm not really sure 
         Dm                          E
If the pills I've been taking are helping 

Am                F     
   I'm wasting my life
           Dm    E
Hurting inside
                     F
I don't really know 
                    Dm
And I'm not really sure


[Chorus]

Am             Am                                  
    Sullen and bored the kids stay 
       F                               Dm
And in this way they wish away each day 
Am                Am                                 
    Stoned in the mall the kids play 
       F                               Dm
And in this way they wish away each day


Am - Am - F - Dm
Am - Am - F - Dm


Am             Am                                  
    Sullen and bored the kids stay 
       F                               Dm
And in this way they wish away each day 
Am             Am                                 
    Stoned in the mall the kids play 
       F                               Dm
And in this way they wish away each day


[Interlude/Solo] 
(played with a similar strum to Trains)

Dsus2 - Am - Dsus2 - F
Dsus2 - Am - Dsus2 - F
Dsus2 - Am - Dsus2 - F
Dsus2 - Am - Dsus2 - F
(solo comes in)
Dsus2 - Am - Dsus2 - F
Dsus2 - Am - Dsus2 - F

[Outro]

Am             Am                       
    Sullen and bored the kids stay 
       F                               Dm
And in this way they wish away each day 
Am             Am                        
    Stoned in the mall the kids play 
       F                               Dm
And in this way they wish away each day 

Am - Am - F - Dm 
 (Fade out.)