English verb conjugation
SHOULD OCCUR

Regular verb: occur - occurred - occurred

Affirmation

Simple form	V-ing form
I'd occur you'd occur he'd occur we'd occur you'd occur they'd occur	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	V-ing 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	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	V-ing 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	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	V-ing 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	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	V-ing form
should I occur? should you occur? should he occur? should we occur? should you occur? should they occur?	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	V-ing 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?	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	V-ing 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?	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	V-ing 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?	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?