Fingering for parallel thirds with repeated note

[scottpilgrim]

What's the best way to do parallel thirds that jump a third such that one more is repeated (i.e. the opening few bars of the left hand of Beethoven Sonata 19 in G minor op. 49 no. 1)? Do I repeat the 3 on the repeated note or do I do something else?

[anacrusis]

In that sonata I just repeat the 3rd finger. There may be other situations where you may do something like 53 42 or 31 42, but it all depends on the context. Do you have any moe examples of where you ae uncertain about the fingering?