I'd be ventilating you'd be ventilating he'd be ventilating we'd be ventilating you'd be ventilating they'd be ventilating
Perfect
I should've ventilated you should've ventilated he should've ventilated we should've ventilated you should've ventilated they should've ventilated
V-ing perfect
I should've been ventilating you should've been ventilating he should've been ventilating we should've been ventilating you should've been ventilating they should've been ventilating
Negation
Simple form
I shouldn't ventilate you shouldn't ventilate he shouldn't ventilate we shouldn't ventilate you shouldn't ventilate they shouldn't ventilate
V-ing form
I shouldn't be ventilating you shouldn't be ventilating he shouldn't be ventilating we shouldn't be ventilating you shouldn't be ventilating they shouldn't be ventilating
Perfect
I shouldn't have ventilated you shouldn't have ventilated he shouldn't have ventilated we shouldn't have ventilated you shouldn't have ventilated they shouldn't have ventilated
V-ing perfect
I shouldn't have been ventilating you shouldn't have been ventilating he shouldn't have been ventilating we shouldn't have been ventilating you shouldn't have been ventilating they shouldn't have been ventilating
Interrogative form
Simple form
should I ventilate? should you ventilate? should he ventilate? should we ventilate? should you ventilate? should they ventilate?
V-ing form
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
should I have ventilated? should you have ventilated? should he have ventilated? should we have ventilated? should you have ventilated? should they have ventilated?
V-ing perfect
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
shouldn't I ventilate? shouldn't you ventilate? shouldn't he ventilate? shouldn't we ventilate? shouldn't you ventilate? shouldn't they ventilate?
V-ing form
shouldn't I be ventilating? shouldn't you be ventilating? shouldn't he be ventilating? shouldn't we be ventilating? shouldn't you be ventilating? shouldn't they be ventilating?
Perfect
shouldn't I have ventilated? shouldn't you have ventilated? shouldn't he have ventilated? shouldn't we have ventilated? shouldn't you have ventilated? shouldn't they have ventilated?
V-ing perfect
shouldn't I have been ventilating? shouldn't you have been ventilating? shouldn't he have been ventilating? shouldn't we have been ventilating? shouldn't you have been ventilating? shouldn't they have been ventilating?