English verb conjugation
MUST VENTILATE

Regular verb: ventilate - ventilated - ventilated

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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