English verb conjugation
SHOULD VENTILATE

Regular verb: ventilate - ventilated - ventilated

Affirmation

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

Negation

Simple form	V-ing form
I should not ventilate you should not ventilate he should not ventilate we should not ventilate you should not ventilate they should not ventilate	I should not be ventilating you should not be ventilating he should not be ventilating we should not be ventilating you should not be ventilating they should not be ventilating
Perfect	V-ing perfect
I should not have ventilated you should not have ventilated he should not have ventilated we should not have ventilated you should not have ventilated they should not have ventilated	I should not have been ventilating you should not have been ventilating he should not have been ventilating we should not have been ventilating you should not have been ventilating they should not have been ventilating

Interrogative form

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

Interro-negative form

Simple form	V-ing form
should I not ventilate? should you not ventilate? should he not ventilate? should we not ventilate? should you not ventilate? should they not ventilate?	should I not be ventilating? should you not be ventilating? should he not be ventilating? should we not be ventilating? should you not be ventilating? should they not be ventilating?
Perfect	V-ing perfect
should I not have ventilated? should you not have ventilated? should he not have ventilated? should we not have ventilated? should you not have ventilated? should they not have ventilated?	should I not have been ventilating? should you not have been ventilating? should he not have been ventilating? should we not have been ventilating? should you not have been ventilating? should they not have been ventilating?