I'd be backpacking you'd be backpacking he'd be backpacking we'd be backpacking you'd be backpacking they'd be backpacking
Perfect
I should've backpacked you should've backpacked he should've backpacked we should've backpacked you should've backpacked they should've backpacked
V-ing perfect
I should've been backpacking you should've been backpacking he should've been backpacking we should've been backpacking you should've been backpacking they should've been backpacking
Negation
Simple form
I shouldn't backpack you shouldn't backpack he shouldn't backpack we shouldn't backpack you shouldn't backpack they shouldn't backpack
V-ing form
I shouldn't be backpacking you shouldn't be backpacking he shouldn't be backpacking we shouldn't be backpacking you shouldn't be backpacking they shouldn't be backpacking
Perfect
I shouldn't have backpacked you shouldn't have backpacked he shouldn't have backpacked we shouldn't have backpacked you shouldn't have backpacked they shouldn't have backpacked
V-ing perfect
I shouldn't have been backpacking you shouldn't have been backpacking he shouldn't have been backpacking we shouldn't have been backpacking you shouldn't have been backpacking they shouldn't have been backpacking
Interrogative form
Simple form
should I backpack? should you backpack? should he backpack? should we backpack? should you backpack? should they backpack?
V-ing form
should I be backpacking? should you be backpacking? should he be backpacking? should we be backpacking? should you be backpacking? should they be backpacking?
Perfect
should I have backpacked? should you have backpacked? should he have backpacked? should we have backpacked? should you have backpacked? should they have backpacked?
V-ing perfect
should I have been backpacking? should you have been backpacking? should he have been backpacking? should we have been backpacking? should you have been backpacking? should they have been backpacking?
Interro-negative form
Simple form
shouldn't I backpack? shouldn't you backpack? shouldn't he backpack? shouldn't we backpack? shouldn't you backpack? shouldn't they backpack?
V-ing form
shouldn't I be backpacking? shouldn't you be backpacking? shouldn't he be backpacking? shouldn't we be backpacking? shouldn't you be backpacking? shouldn't they be backpacking?
Perfect
shouldn't I have backpacked? shouldn't you have backpacked? shouldn't he have backpacked? shouldn't we have backpacked? shouldn't you have backpacked? shouldn't they have backpacked?
V-ing perfect
shouldn't I have been backpacking? shouldn't you have been backpacking? shouldn't he have been backpacking? shouldn't we have been backpacking? shouldn't you have been backpacking? shouldn't they have been backpacking?