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 should've prevented you should've prevented she should've prevented we should've prevented you should've prevented they should've prevented
Perfect en V-ing
I should've been preventing you should've been preventing she should've been preventing we should've been preventing you should've been preventing they should've been preventing
Négation
Forme simple
I shouldn't prevent you shouldn't prevent she shouldn't prevent we shouldn't prevent you shouldn't prevent they shouldn't prevent
Forme en V-ing
I shouldn't be preventing you shouldn't be preventing she shouldn't be preventing we shouldn't be preventing you shouldn't be preventing they shouldn't be preventing
Perfect
I shouldn't have prevented you shouldn't have prevented she shouldn't have prevented we shouldn't have prevented you shouldn't have prevented they shouldn't have prevented
Perfect en V-ing
I shouldn't have been preventing you shouldn't have been preventing she shouldn't have been preventing we shouldn't have been preventing you shouldn't have been preventing they shouldn't have been preventing
Forme interrogative
Forme simple
should I prevent? should you prevent? should she prevent? should we prevent? should you prevent? should they prevent?
Forme en V-ing
should I be preventing? should you be preventing? should she be preventing? should we be preventing? should you be preventing? should they be preventing?
Perfect
should I have prevented? should you have prevented? should she have prevented? should we have prevented? should you have prevented? should they have prevented?
Perfect en V-ing
should I have been preventing? should you have been preventing? should she have been preventing? should we have been preventing? should you have been preventing? should they have been preventing?
Forme interro-négative
Forme simple
shouldn't I prevent? shouldn't you prevent? shouldn't she prevent? shouldn't we prevent? shouldn't you prevent? shouldn't they prevent?
Forme en V-ing
shouldn't I be preventing? shouldn't you be preventing? shouldn't she be preventing? shouldn't we be preventing? shouldn't you be preventing? shouldn't they be preventing?
Perfect
shouldn't I have prevented? shouldn't you have prevented? shouldn't she have prevented? shouldn't we have prevented? shouldn't you have prevented? shouldn't they have prevented?
Perfect en V-ing
shouldn't I have been preventing? shouldn't you have been preventing? shouldn't she have been preventing? shouldn't we have been preventing? shouldn't you have been preventing? shouldn't they have been preventing?