English verb conjugation
OUGHT TO PREHEAT

Regular verb: preheat - preheated - preheated

Affirmation

Simple form	V-ing form
I ought to preheat you ought to preheat he ought to preheat we ought to preheat you ought to preheat they ought to preheat	I ought to be preheating you ought to be preheating he ought to be preheating we ought to be preheating you ought to be preheating they ought to be preheating
Perfect	V-ing perfect
I ought to have preheated you ought to have preheated he ought to have preheated we ought to have preheated you ought to have preheated they ought to have preheated	I ought to have been preheating you ought to have been preheating he ought to have been preheating we ought to have been preheating you ought to have been preheating they ought to have been preheating

Negation

Simple form	V-ing form
I oughtn't to preheat you oughtn't to preheat he oughtn't to preheat we oughtn't to preheat you oughtn't to preheat they oughtn't to preheat	I oughtn't to be preheating you oughtn't to be preheating he oughtn't to be preheating we oughtn't to be preheating you oughtn't to be preheating they oughtn't to be preheating
Perfect	V-ing perfect
I oughtn't to have preheated you oughtn't to have preheated he oughtn't to have preheated we oughtn't to have preheated you oughtn't to have preheated they oughtn't to have preheated	I oughtn't to have been preheating you oughtn't to have been preheating he oughtn't to have been preheating we oughtn't to have been preheating you oughtn't to have been preheating they oughtn't to have been preheating

Interrogative form

Simple form	V-ing form
ought to I preheat? ought to you preheat? ought to he preheat? ought to we preheat? ought to you preheat? ought to they preheat?	ought to I be preheating? ought to you be preheating? ought to he be preheating? ought to we be preheating? ought to you be preheating? ought to they be preheating?
Perfect	V-ing perfect
ought to I have preheated? ought to you have preheated? ought to he have preheated? ought to we have preheated? ought to you have preheated? ought to they have preheated?	ought to I have been preheating? ought to you have been preheating? ought to he have been preheating? ought to we have been preheating? ought to you have been preheating? ought to they have been preheating?

Interro-negative form

Simple form	V-ing form
oughtn't I to preheat? oughtn't you to preheat? oughtn't he to preheat? oughtn't we to preheat? oughtn't you to preheat? oughtn't they to preheat?	oughtn't I to be preheating? oughtn't you to be preheating? oughtn't he to be preheating? oughtn't we to be preheating? oughtn't you to be preheating? oughtn't they to be preheating?
Perfect	V-ing perfect
oughtn't I to have preheated? oughtn't you to have preheated? oughtn't he to have preheated? oughtn't we to have preheated? oughtn't you to have preheated? oughtn't they to have preheated?	oughtn't I to have been preheating? oughtn't you to have been preheating? oughtn't he to have been preheating? oughtn't we to have been preheating? oughtn't you to have been preheating? oughtn't they to have been preheating?