I'd be ventilating you'd be ventilating she'd be ventilating we'd be ventilating you'd be ventilating they'd be ventilating
Perfect
I should've ventilated you should've ventilated she 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 she 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 she 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 she 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 she 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 she 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 she ventilate? should we ventilate? should you ventilate? should they ventilate?
V-ing form
should I be ventilating? should you be ventilating? should she be ventilating? should we be ventilating? should you be ventilating? should they be ventilating?
Perfect
should I have ventilated? should you have ventilated? should she 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 she 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 she 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 she 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 she 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 she have been ventilating? shouldn't we have been ventilating? shouldn't you have been ventilating? shouldn't they have been ventilating?