The fills at the end of every 2nd line are a basic (and pretty common) D riff thus: Dsus2 D Dsus4 D Dsus2 D. The riff timings can be a little tricky when singing along, but listen to the song and it will make sense. The E A A at the end of the 3rd line of the chorus are 3 distinct "single hit" chords. Again, listen and it will make sense. For...