pygame and shift branching?

[MuntyScruntfundle]

Sorry, I know this is another pygame problem, but I hope some kind person can help.

I can find examples on the google how to check for key presses such as a+Shift. I can't fond how to check for these separately, I want to do something like:

If SHIFT
if a pressed:
if b pressed:

if Not SHIFT
if a pressed:
if b pressed:

This must be possible?

Thanks.