must prevent
Verbo regolare: prevent - prevented- prevented

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must prevent
you must prevent
she must prevent
we must prevent
you must prevent
they must prevent 	I must be preventing
you must be preventing
she must be preventing
we must be preventing
you must be preventing
they must be preventing	I must have prevented
you must have prevented
she must have prevented
we must have prevented
you must have prevented
they must have prevented	I must have been preventing
you must have been preventing
she must have been preventing
we must have been preventing
you must have been preventing
they must have been preventing	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I mustn't prevent
you mustn't prevent
she mustn't prevent
we mustn't prevent
you mustn't prevent
they mustn't prevent 	I mustn't be preventing
you mustn't be preventing
she mustn't be preventing
we mustn't be preventing
you mustn't be preventing
they mustn't be preventing	I mustn't have prevented
you mustn't have prevented
she mustn't have prevented
we mustn't have prevented
you mustn't have prevented
they mustn't have prevented	I mustn't have been preventing
you mustn't have been preventing
she mustn't have been preventing
we mustn't have been preventing
you mustn't have been preventing
they mustn't have been preventing	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I prevent?
must you prevent?
must she prevent?
must we prevent?
must you prevent?
must they prevent? 	must I be preventing?
must you be preventing?
must she be preventing?
must we be preventing?
must you be preventing?
must they be preventing? 	must I have prevented?
must you have prevented?
must she have prevented?
must we have prevented?
must you have prevented?
must they have prevented? 	must I have been preventing?
must you have been preventing?
must she have been preventing?
must we have been preventing?
must you have been preventing?
must they have been preventing? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
mustn't I prevent?
mustn't you prevent?
mustn't she prevent?
mustn't we prevent?
mustn't you prevent?
mustn't they prevent? 	mustn't I be preventing?
mustn't you be preventing?
mustn't she be preventing?
mustn't we be preventing?
mustn't you be preventing?
mustn't they be preventing? 	mustn't I have prevented?
mustn't you have prevented?
mustn't she have prevented?
mustn't we have prevented?
mustn't you have prevented?
mustn't they have prevented? 	mustn't I have been preventing?
mustn't you have been preventing?
mustn't she have been preventing?
mustn't we have been preventing?
mustn't you have been preventing?
mustn't they have been preventing?