English verb conjugation
SHOULD OCCUR

Regular verb: occur - occurred - occurred

Affirmation

Simple form	V-ing form
I'd occur you'd occur she'd occur we'd occur you'd occur they'd occur	I'd be occurring you'd be occurring she'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 she 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 she 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 she 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 she 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 she 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 she 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 she occur? should we occur? should you occur? should they occur?	should I be occurring? should you be occurring? should she 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 she 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 she 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 she 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 she 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 she 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 she have been occurring? shouldn't we have been occurring? shouldn't you have been occurring? shouldn't they have been occurring?