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