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