The intro is easy, it just alternates between G and C fairly regularly. The rest of the song sometimes alternates between G and C, but the rhythm is different. C is played just in passing really, then goes back to the G before starting the bar Listen carefully to the song and you'll get it. The D / Dsus2 / D part is played similarly, but again you need to listed to the song. The final part seems to go from D to Dsus2 to C in a similar rhythm One final note, I know this isn't 100% but it's (guitartabs.cc)