ought to occur
Regular verb: occur - occurred- occurred

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to occur
you ought to occur
he ought to occur
we ought to occur
you ought to occur
they ought to occur 	I ought to be occurring
you ought to be occurring
he ought to be occurring
we ought to be occurring
you ought to be occurring
they ought to be occurring	I ought to have occurred
you ought to have occurred
he ought to have occurred
we ought to have occurred
you ought to have occurred
they ought to have occurred	I ought to have been occurring
you ought to have been occurring
he ought to have been occurring
we ought to have been occurring
you ought to have been occurring
they ought to have been occurring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought not to occur
you ought not to occur
he ought not to occur
we ought not to occur
you ought not to occur
they ought not to occur 	I ought not to occurring
you ought not to occurring
he ought not to occurring
we ought not to occurring
you ought not to occurring
they ought not to occurring	I ought not to have occurred
you ought not to have occurred
he ought not to have occurred
we ought not to have occurred
you ought not to have occurred
they ought not to have occurred	I ought not to have been occurring
you ought not to have been occurring
he ought not to have been occurring
we ought not to have been occurring
you ought not to have been occurring
they ought not to have been occurring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I occur?
ought to you occur?
ought to he occur?
ought to we occur?
ought to you occur?
ought to they occur? 	ought to I be occurring?
ought to you be occurring?
ought to he be occurring?
ought to we be occurring?
ought to you be occurring?
ought to they be occurring? 	ought to I have occurred?
ought to you have occurred?
ought to he have occurred?
ought to we have occurred?
ought to you have occurred?
ought to they have occurred? 	ought to I have been occurring?
ought to you have been occurring?
ought to he have been occurring?
ought to we have been occurring?
ought to you have been occurring?
ought to they have been occurring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought I not to occur?
ought you not to occur?
ought he not to occur?
ought we not to occur?
ought you not to occur?
ought they not to occur? 	ought I not to be occurring?
ought you not to be occurring?
ought he not to be occurring?
ought we not to be occurring?
ought you not to be occurring?
ought they not to be occurring? 	ought I not to have occurred?
ought you not to have occurred?
ought he not to have occurred?
ought we not to have occurred?
ought you not to have occurred?
ought they not to have occurred? 	ought I not to have been occurring?
ought you not to have been occurring?
ought he not to have been occurring?
ought we not to have been occurring?
ought you not to have been occurring?
ought they not to have been occurring?