I'd be preventing you'd be preventing she'd be preventing we'd be preventing you'd be preventing they'd be preventing
Perfect
I would've prevented you would've prevented she would've prevented we would've prevented you would've prevented they would've prevented
V-ing perfect
I would've been preventing you would've been preventing she would've been preventing we would've been preventing you would've been preventing they would've been preventing
Negation
Simple form
I wouldn't prevent you wouldn't prevent she wouldn't prevent we wouldn't prevent you wouldn't prevent they wouldn't prevent
V-ing form
I wouldn't be preventing you wouldn't be preventing she wouldn't be preventing we wouldn't be preventing you wouldn't be preventing they wouldn't be preventing
Perfect
I wouldn't have prevented you wouldn't have prevented she wouldn't have prevented we wouldn't have prevented you wouldn't have prevented they wouldn't have prevented
V-ing perfect
I wouldn't have been preventing you wouldn't have been preventing she wouldn't have been preventing we wouldn't have been preventing you wouldn't have been preventing they wouldn't have been preventing
Interrogative form
Simple form
would I prevent? would you prevent? would she prevent? would we prevent? would you prevent? would they prevent?
V-ing form
would I be preventing? would you be preventing? would she be preventing? would we be preventing? would you be preventing? would they be preventing?
Perfect
would I have prevented? would you have prevented? would she have prevented? would we have prevented? would you have prevented? would they have prevented?
V-ing perfect
would I have been preventing? would you have been preventing? would she have been preventing? would we have been preventing? would you have been preventing? would they have been preventing?
Interro-negative form
Simple form
wouldn't I prevent? wouldn't you prevent? wouldn't she prevent? wouldn't we prevent? wouldn't you prevent? wouldn't they prevent?
V-ing form
wouldn't I be preventing? wouldn't you be preventing? wouldn't she be preventing? wouldn't we be preventing? wouldn't you be preventing? wouldn't they be preventing?
Perfect
wouldn't I have prevented? wouldn't you have prevented? wouldn't she have prevented? wouldn't we have prevented? wouldn't you have prevented? wouldn't they have prevented?
V-ing perfect
wouldn't I have been preventing? wouldn't you have been preventing? wouldn't she have been preventing? wouldn't we have been preventing? wouldn't you have been preventing? wouldn't they have been preventing?