I'd be double-checking you'd be double-checking she'd be double-checking we'd be double-checking you'd be double-checking they'd be double-checking
Perfect
I should've double-checked you should've double-checked she should've double-checked we should've double-checked you should've double-checked they should've double-checked
V-ing perfect
I should've been double-checking you should've been double-checking she should've been double-checking we should've been double-checking you should've been double-checking they should've been double-checking
Negation
Simple form
I shouldn't double-check you shouldn't double-check she shouldn't double-check we shouldn't double-check you shouldn't double-check they shouldn't double-check
V-ing form
I shouldn't be double-checking you shouldn't be double-checking she shouldn't be double-checking we shouldn't be double-checking you shouldn't be double-checking they shouldn't be double-checking
Perfect
I shouldn't have double-checked you shouldn't have double-checked she shouldn't have double-checked we shouldn't have double-checked you shouldn't have double-checked they shouldn't have double-checked
V-ing perfect
I shouldn't have been double-checking you shouldn't have been double-checking she shouldn't have been double-checking we shouldn't have been double-checking you shouldn't have been double-checking they shouldn't have been double-checking
Interrogative form
Simple form
should I double-check? should you double-check? should she double-check? should we double-check? should you double-check? should they double-check?
V-ing form
should I be double-checking? should you be double-checking? should she be double-checking? should we be double-checking? should you be double-checking? should they be double-checking?
Perfect
should I have double-checked? should you have double-checked? should she have double-checked? should we have double-checked? should you have double-checked? should they have double-checked?
V-ing perfect
should I have been double-checking? should you have been double-checking? should she have been double-checking? should we have been double-checking? should you have been double-checking? should they have been double-checking?
Interro-negative form
Simple form
shouldn't I double-check? shouldn't you double-check? shouldn't she double-check? shouldn't we double-check? shouldn't you double-check? shouldn't they double-check?
V-ing form
shouldn't I be double-checking? shouldn't you be double-checking? shouldn't she be double-checking? shouldn't we be double-checking? shouldn't you be double-checking? shouldn't they be double-checking?
Perfect
shouldn't I have double-checked? shouldn't you have double-checked? shouldn't she have double-checked? shouldn't we have double-checked? shouldn't you have double-checked? shouldn't they have double-checked?
V-ing perfect
shouldn't I have been double-checking? shouldn't you have been double-checking? shouldn't she have been double-checking? shouldn't we have been double-checking? shouldn't you have been double-checking? shouldn't they have been double-checking?