For the E string in the D7 shape it’s best to use your ring finger to play the alternating bass notes. The proper way to finger this chord is 5th string – ring, 4th string – middle, 3rd string, pinky, 2nd string – index.

I’m not sure what you mean about the C chord progression, the second chords is a G, so I must be misunderstanding the questions.

Thanks again,
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thrope :
Also I find it hard to thumb the low E string in the D7 shape, so I was playing the alternating bass by moving my second finger as required. It might be nice to say something about whether this is OK or not.

Whoops, I mean my third or ring finger of course here.

First, in the E pattern/A pattern progression the tab is clear enough, but I don’t find the chord diagrams very helpful. The ones labelled E7 and A7 are the chords I know as straigh E and A, and they don’t appear in the progression anyway which is all the D7 / G7 shapes. Is it a mistake in the chord diagram? Also I find it hard to thumb the low E string in the D7 shape, so I was playing the alternating bass by moving my second finger as required. It might be nice to say something about whether this is OK or not.

The final one I’m not sure on is the first case of the C progression. The last two bass notes of the second bar are from a G chord, which moves moving the second finger out of the C progression. It sounds really good, but the fact that it doesn’t appear like that in any of the later progressions made me think maybe it was a mistake? For beginners I think it’s easier to stay where it is, but it does sound really good so I’m not sure.

Thanks again for this terrific resource, I hope you don’t mind a bit of proof reading from someone following it through carefully!