This has some solid concepts and is a good song to study for chord sequences.
I had always wanted to learn this song, and that is the cool thing about teaching, students give you a reason to learn it.
As with a lot of McCartney songs, he makes use of changing the 4th chord in the scale (in this case, F) to a minor chord (Fm) for a nice effect.
Once you recognise that sound you can pick it out quite easily in other songs. Download View Page