What's the difference between:
What should we be doing if
theinflation goes up?
What should we do if inflation goes up?
The progressive form here indicates an increased concern about the problem. The progressive makes the action more immediate to perception.
I wouldn't suggest this construction to refer to a conditional, hypothetical future.
However, it can be used in such examples:
The second fits in here best:
The first would fit in good enough if it were constructed this way: