English verb conjugation
OUGHT TO VENTILATE

Regular verb: ventilate - ventilated - ventilated

Affirmation

Simple form	V-ing form
I ought to ventilate you ought to ventilate he ought to ventilate we ought to ventilate you ought to ventilate they ought to ventilate	I ought to be ventilating you ought to be ventilating he ought to be ventilating we ought to be ventilating you ought to be ventilating they ought to be ventilating
Perfect	V-ing perfect
I ought to have ventilated you ought to have ventilated he ought to have ventilated we ought to have ventilated you ought to have ventilated they ought to have ventilated	I ought to have been ventilating you ought to have been ventilating he ought to have been ventilating we ought to have been ventilating you ought to have been ventilating they ought to have been ventilating

Negation

Simple form	V-ing form
I oughtn't to ventilate you oughtn't to ventilate he oughtn't to ventilate we oughtn't to ventilate you oughtn't to ventilate they oughtn't to ventilate	I oughtn't to be ventilating you oughtn't to be ventilating he oughtn't to be ventilating we oughtn't to be ventilating you oughtn't to be ventilating they oughtn't to be ventilating
Perfect	V-ing perfect
I oughtn't to have ventilated you oughtn't to have ventilated he oughtn't to have ventilated we oughtn't to have ventilated you oughtn't to have ventilated they oughtn't to have ventilated	I oughtn't to have been ventilating you oughtn't to have been ventilating he oughtn't to have been ventilating we oughtn't to have been ventilating you oughtn't to have been ventilating they oughtn't to have been ventilating

Interrogative form

Simple form	V-ing form
ought to I ventilate? ought to you ventilate? ought to he ventilate? ought to we ventilate? ought to you ventilate? ought to they ventilate?	ought to I be ventilating? ought to you be ventilating? ought to he be ventilating? ought to we be ventilating? ought to you be ventilating? ought to they be ventilating?
Perfect	V-ing perfect
ought to I have ventilated? ought to you have ventilated? ought to he have ventilated? ought to we have ventilated? ought to you have ventilated? ought to they have ventilated?	ought to I have been ventilating? ought to you have been ventilating? ought to he have been ventilating? ought to we have been ventilating? ought to you have been ventilating? ought to they have been ventilating?

Interro-negative form

Simple form	V-ing form
oughtn't I to ventilate? oughtn't you to ventilate? oughtn't he to ventilate? oughtn't we to ventilate? oughtn't you to ventilate? oughtn't they to ventilate?	oughtn't I to be ventilating? oughtn't you to be ventilating? oughtn't he to be ventilating? oughtn't we to be ventilating? oughtn't you to be ventilating? oughtn't they to be ventilating?
Perfect	V-ing perfect
oughtn't I to have ventilated? oughtn't you to have ventilated? oughtn't he to have ventilated? oughtn't we to have ventilated? oughtn't you to have ventilated? oughtn't they to have ventilated?	oughtn't I to have been ventilating? oughtn't you to have been ventilating? oughtn't he to have been ventilating? oughtn't we to have been ventilating? oughtn't you to have been ventilating? oughtn't they to have been ventilating?