English verb conjugation
OUGHT TO COMBUST

Regular verb: combust - combusted - combusted

Affirmation

Simple form	V-ing form
I ought to combust you ought to combust she 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 she ought to be combusting we ought to be combusting you ought to be combusting they ought to be combusting
Perfect	V-ing perfect
I ought to have combusted you ought to have combusted she 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 she 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
I oughtn't to combust you oughtn't to combust she 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 she oughtn't to be combusting we oughtn't to be combusting you oughtn't to be combusting they oughtn't to be combusting
Perfect	V-ing perfect
I oughtn't to have combusted you oughtn't to have combusted she 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 she 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
ought to I combust? ought to you combust? ought to she 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 she be combusting? ought to we be combusting? ought to you be combusting? ought to they be combusting?
Perfect	V-ing perfect
ought to I have combusted? ought to you have combusted? ought to she 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 she 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
oughtn't I to combust? oughtn't you to combust? oughtn't she 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 she to be combusting? oughtn't we to be combusting? oughtn't you to be combusting? oughtn't they to be combusting?
Perfect	V-ing perfect
oughtn't I to have combusted? oughtn't you to have combusted? oughtn't she 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 she 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?