ought to combust
Regular verb: combust - combusted- combusted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to combust
you ought to combust
he ought to combust
we ought to combust
you ought to combust
they ought to combust 	I ought to be combusting
you ought to be combusting
he ought to be combusting
we ought to be combusting
you ought to be combusting
they ought to be combusting	I ought to have combusted
you ought to have combusted
he ought to have combusted
we ought to have combusted
you ought to have combusted
they ought to have combusted	I ought to have been combusting
you ought to have been combusting
he ought to have been combusting
we ought to have been combusting
you ought to have been combusting
they ought to have been combusting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I oughtn't to combust
you oughtn't to combust
he oughtn't to combust
we oughtn't to combust
you oughtn't to combust
they oughtn't to combust 	I oughtn't to be combusting
you oughtn't to be combusting
he oughtn't to be combusting
we oughtn't to be combusting
you oughtn't to be combusting
they oughtn't to be combusting	I oughtn't to have combusted
you oughtn't to have combusted
he oughtn't to have combusted
we oughtn't to have combusted
you oughtn't to have combusted
they oughtn't to have combusted	I oughtn't to have been combusting
you oughtn't to have been combusting
he oughtn't to have been combusting
we oughtn't to have been combusting
you oughtn't to have been combusting
they oughtn't to have been combusting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I combust?
ought to you combust?
ought to he combust?
ought to we combust?
ought to you combust?
ought to they combust? 	ought to I be combusting?
ought to you be combusting?
ought to he be combusting?
ought to we be combusting?
ought to you be combusting?
ought to they be combusting? 	ought to I have combusted?
ought to you have combusted?
ought to he have combusted?
ought to we have combusted?
ought to you have combusted?
ought to they have combusted? 	ought to I have been combusting?
ought to you have been combusting?
ought to he have been combusting?
ought to we have been combusting?
ought to you have been combusting?
ought to they have been combusting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
oughtn't I to combust?
oughtn't you to combust?
oughtn't he to combust?
oughtn't we to combust?
oughtn't you to combust?
oughtn't they to combust? 	oughtn't I to be combusting?
oughtn't you to be combusting?
oughtn't he to be combusting?
oughtn't we to be combusting?
oughtn't you to be combusting?
oughtn't they to be combusting? 	oughtn't I to have combusted?
oughtn't you to have combusted?
oughtn't he to have combusted?
oughtn't we to have combusted?
oughtn't you to have combusted?
oughtn't they to have combusted? 	oughtn't I to have been combusting?
oughtn't you to have been combusting?
oughtn't he to have been combusting?
oughtn't we to have been combusting?
oughtn't you to have been combusting?
oughtn't they to have been combusting?