These are the 4 Chords involved in the song in order, F, Dm, Am, B. All of these 
are in a bar chord shape.

FLast (133211@1)week, I was passenger on a car seat
DmThinking (xx0231@1)of decision that I made within a heart beat! 
AmShe (x02210@1)used to make my heartbeat but usually alarms me my lungs are over
BWorking (x2444x@1)and I (cant breathe)

And the Chorus is the same F Dm Am B.

Enjoy :)